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O

[edit]
  2. O Street Market
  3. O'Bannon Homestead
  4. O'Bannon Mill
  5. O'Blenis House
  6. O'Brien County Courthouse
  7. O'Brien Electric Priming Company
  8. O'Brien General Store and Post Office
  9. O'Brien–Peuschel Farmstead
  10. O'Connor House (St. Thomas, North Dakota)
  11. O'Connor–Proctor Building
  12. O'Dea House (Berwyn Heights, Maryland)
  13. O'Donel House and Farm
  14. O'Donnell Building
  15. O'Donnell House (Sumter, South Carolina)
  16. O'Fallons Bluff
  17. O'Hanlon Building
  18. O'Hara Waltham Dial factory
  19. O'Kane Building
  20. O'Kane Market and O'Kane Building
  21. O'Kane-Jacobs House
  22. O'Kelly's Chapel
  23. O'Leno State Park
  24. O'Neill Site
  25. O'Reilly House
  26. O'Shaughnessy Dam (Ohio)
  27. O'Shea Building
  28. O. Arthur Kirkman House and Outbuildings
  29. O. B. McFadden House
  30. O. C. Barber Barn No. 1
  31. O. C. Barber Colt Barn
  32. O. C. Barber Creamery
  33. O. C. Barber Machine Barn
  34. O. C. Barber Piggery
  35. O. E. Payne House
  36. O. E. Rolvaag House
  37. O. E. Walker House
  38. O. F. Short House
  39. O. H. Booth Hose Company
  40. O. Henry Hall
  41. O. J. Daniels House
  42. O. K. Palmer House
  43. O. T. Bassett Tower
  44. O. W. Gardner House
  45. O.A.E. Blyberg House
  46. O.B. Grant House
  47. O.D. Gunn Trade and Sale Barn
  48. O.F. and Lulu E. Fryer House
  49. O.H.P. Tanner House
  50. O.J. Walker
  51. O.L. Dunaway House
  52. O.M. Edwards Building
  53. O.P. Wickham House
  54. OK Theatre
  55. OTO Homestead and Dude Ranch
  56. Oahu Railway and Land Company
  57. Oak Alley Plantation
  58. Oak Ballroom
  59. Oak Cemetery
  60. Oak Circle Historic District
  61. Oak City Christian Church
  62. Oak Creek Parkway
  63. Oak Crest
  64. Oak Dell
  65. Oak Flat (Arizona)
  66. Oak Forest (Mechanicsville, Virginia)
  67. Oak Glen (Portsmouth, Rhode Island)
  68. Oak Grove (Altavista, Virginia)
  69. Oak Grove (Church Hill, Mississippi)
  70. Oak Grove (Eastville, Virginia)
  71. Oak Grove (Erwin, North Carolina)
  72. Oak Grove (Hampton County, South Carolina)
  73. Oak Grove (La Plata, Maryland)
  74. Oak Grove (Manakin-Sabot, Virginia)
  75. Oak Grove Butterfield Stage Station
  76. Oak Grove Cemetery (Conway, Arkansas)
  77. Oak Grove Cemetery (Des Arc, Arkansas)
  78. Oak Grove Cemetery (Fall River, Massachusetts)
  79. Oak Grove Cemetery (Falmouth, Massachusetts)
  80. Oak Grove Cemetery (Gloucester, Massachusetts)
  81. Oak Grove Cemetery (New Bedford, Massachusetts)
  82. Oak Grove Community House
  83. Oak Grove Farm
  84. Oak Grove Methodist Church
  85. Oak Grove Missionary Baptist Church
  86. Oak Grove Rosenwald School
  87. Oak Grove School (Grant County, Arkansas)
  88. Oak Grove School (Prairieville, Alabama)
  89. Oak Grove School (Winston-Salem, North Carolina)
  90. Oak Hall (Brentwood, Tennessee)
  91. Oak Hall (Bunkie, Louisiana)
  92. Oak Hall Historic District
  93. Oak Hill (Annandale, Virginia)
  94. Oak Hill (Calvert City, Kentucky)
  95. Oak Hill (Chillicothe, Ohio)
  96. Oak Hill (Colonial Heights, Virginia)
  97. Oak Hill (Cumberland, Virginia)
  98. Oak Hill (Delaplane, Virginia)
  99. Oak Hill (James Monroe house)
  100. Oak Hill (Linlithgo, New York)
  101. Oak Hill Cemetery (Bartow, Florida)
  102. Oak Hill Cemetery (Birmingham, Alabama)
  103. Oak Hill Cemetery (Cedar Rapids, Iowa)
  104. Oak Hill Cemetery (Evansville, Indiana)
  105. Oak Hill Cemetery (Lawrence, Kansas)
  106. Oak Hill Cemetery (Lebanon, Indiana)
  107. Oak Hill Cemetery (Lewistown, Illinois)
  108. Oak Hill Cemetery (Newnan, Georgia)
  109. Oak Hill Cemetery (Oak Hill, New York)
  110. Oak Hill Cemetery (Pontiac, Michigan)
  111. Oak Hill Cemetery Chapel (Bellows Falls, Vermont)
  112. Oak Hill Cemetery Chapel (Washington, D.C.)
  113. Oak Hill Cottage
  114. Oak Hill Country Club
  115. Oak Hill Estate
  116. Oak Hill Farm
  117. Oak Hill Historic District (Fort Dodge, Iowa)
  118. Oak Hill Historic District (Hagerstown, Maryland)
  119. Oak Hill Historic District (Oak Hill, Alabama)
  120. Oak Hill Mausoleum
  121. Oak Hill Methodist Episcopal Church
  122. Oak Hill Park Historic District
  123. Oak Hill School House
  124. Oak Hill Welsh Congregational Church
  125. Oak Hill station
  126. Oak Hills, Oregon
  127. Oak Island (South Carolina)
  128. Oak Island Life Saving Station
  129. Oak Island Light
  130. Oak Knoll (Winchester, Massachusetts)
  131. Oak Lane Historic District
  132. Oak Lawn (Charlottesville, Virginia)
  133. Oak Lawn (Huntsboro, North Carolina)
  134. Oak Lawn (Madison Heights, Virginia)
  135. Oak Lawn (Ridgely, Maryland)
  136. Oak Lawn Farm Dairy Barn
  137. Oak Lawn Methodist Episcopal Church, South
  138. Oak Lodge
  139. Oak Park Conservatory
  140. Oak Park Historic District
  141. Oak Park Village Hall
  142. Oak Place (Huntsville, Alabama)
  143. Oak Plain Presbyterian Church
  144. Oak Ridge (Danville, Virginia)
  145. Oak Ridge Apartments
  146. Oak Ridge Cemetery
  147. Oak Ridge Historic District
  148. Oak Ridge Military Academy
  149. Oak Ridge Railroad Overpass
  150. Oak Ridge gatehouses
  151. Oak Spring Farm
  152. Oak Square School
  153. Oak Street Garage
  154. Oak Street School (Fulton, New York)
  155. Oak Top
  156. Oakcliff
  157. Oakdale (Floyd, Virginia)
  158. Oakdale (Pennsbury Township, Pennsylvania)
  159. Oakdale Cemetery (Hendersonville, North Carolina)
  160. Oakdale Cotton Mill Village
  161. Oakdale Historic District
  162. Oakdale Manor
  163. Oakdale Memorial Gardens
  164. Oakdale Public School
  165. Oakdale School (Madison, Indiana)
  166. Oakdale Village Historic District
  167. Oakdene (Staunton, Virginia)
  168. Oakenshawe Historic District
  169. Oakes Estate
  170. Oakes National Bank Block
  171. Oakes Post Office
  172. Oakes-Wood House
  173. Oakey Streak Methodist Episcopal Church
  174. Oakfield station
  175. Oakforest
  176. Oakham Center Historic District
  177. Oakham Farm
  178. Oakhill (Marshall, Michigan)
  179. Oakhurst (Emelle, Alabama)
  180. Oakhurst Historic District
  181. Oakhurst Links
  182. Oakhurst–Gildersleeve Neighborhood Historic District
  183. Oaklana
  184. Oakland (9 Oakhurst Drive, Natchez, Mississippi)
  185. Oakland (Airlie, North Carolina)
  186. Oakland (Bryantown, Maryland)
  187. Oakland (El Dorado, Arkansas)
  188. Oakland (Gallatin, Tennessee)
  189. Oakland (Montpelier, Virginia)
  190. Oakland (Parkersburg, West Virginia)
  191. Oakland Avenue Historic District
  192. Oakland Cemetery (Atlanta)
  193. Oakland Cemetery (Camden, Arkansas)
  194. Oakland Cemetery (Fort Dodge, Iowa)
  195. Oakland Cemetery (Princeton, Illinois)
  196. Oakland Cemetery (Trenton, Tennessee)
  197. Oakland City Hall
  198. Oakland Farm
  199. Oakland Grove Presbyterian Church
  200. Oakland Hall
  201. Oakland Historic District (Oakland, Maryland)
  202. Oakland Historic District (Oakland, Oregon)
  203. Oakland Hotel
  204. Oakland Memorial Chapel
  205. Oakland Mill
  206. Oakland Mills Blacksmith House and Shop
  207. Oakland Mills Bridge
  208. Oakland Park Elementary School
  209. Oakland Plantation (Beech Island, South Carolina)
  210. Oakland Plantation (Carvers, North Carolina)
  211. Oakland Plantation (Fort Motte, South Carolina)
  212. Oakland Plantation (Natchitoches Parish, Louisiana)
  213. Oakland Plantation (Tarboro, North Carolina)
  214. Oakland Plantation House (Gurley, Louisiana)
  215. Oakland Plantation House (Mount Pleasant, South Carolina)
  216. Oakland Presbyterian Church
  217. Oakland Public Library (Oakland, Maine)
  218. Oakland Public School
  219. Oakland station (Maryland)
  220. Oakland, Rhode Island
  221. Oakland-Fraternal Cemetery
  222. Oaklandon Historic District
  223. Oaklands (Gardiner, Maine)
  224. Oaklands (West Whiteland Township, Pennsylvania)
  225. Oaklands Historic House Museum
  226. Oakland–Dousman Historic District
  227. Oaklawn (Huntsville, Alabama)
  228. Oaklawn Cemetery
  229. Oaklawn Farm
  230. Oaklawn Garden
  231. Oaklawn Manor
  232. Oaklawn Plantation (Natchez, Louisiana)
  233. Oaklawn, Rhode Island
  234. Oakleigh Garden Historic District
  235. Oakleigh Historic Complex (Mobile, Alabama)
  236. Oaklette Historic District
  237. Oakley (Gallatin, Tennessee)
  238. Oakley (Heathsville, Virginia)
  239. Oakley (Spotsylvania County, Virginia)
  240. Oakley (Upperville, Virginia)
  241. Oakley Chapel African Methodist Episcopal Church
  242. Oakley Farm (Warm Springs, Virginia)
  243. Oakley High School Stadium
  244. Oakley Hill
  245. Oakley, Idaho
  246. Oaklyn Plantation
  247. Oakmont (Greenville, North Carolina)
  248. Oakmont Country Club
  249. Oakridge (Blackstone, Virginia)
  250. Oaks Cloister
  251. Oaks Hotel
  252. Oaks II
  253. Oakslea Place
  254. Oakton Gables
  255. Oakton Historic District
  256. Oakton Trolley Station
  257. Oakwood (Fauquier County, Virginia)
  258. Oakwood (Fayette, Missouri)
  259. Oakwood (Gadsden, South Carolina)
  260. Oakwood (Harwood, Maryland)
  261. Oakwood Avenue Presbyterian Church
  262. Oakwood Cemetery (Austin, Texas)
  263. Oakwood Cemetery (Fort Worth, Texas)
  264. Oakwood Cemetery (Niagara Falls, New York)
  265. Oakwood Cemetery (Troy, New York)
  266. Oakwood Cemetery Chapel (Allegan, Michigan)
  267. Oakwood Cemetery Chapel (Cuyahoga Falls, Ohio)
  268. Oakwood Cemetery Mausoleum
  269. Oakwood Estate
  270. Oakwood Historic District (Hickory, North Carolina)
  271. Oakwood Historic District (High Point, North Carolina)
  272. Oakwood–Chimborazo Historic District
  273. Oaky Grove
  274. Oark School-Methodist Church
  275. Oasis Court
  276. Oates Building
  277. Oates House
  278. Oates–Reynolds Memorial Building
  279. Oatlands Historic House & Gardens
  280. Oatman Drug Company Building
  281. Oatman Filling Station
  282. Oats Park Grammar School
  283. Obadiah Smith House
  284. Obediah Barber Homestead
  285. Obediah Farrar House
  286. Obediah Shirley House
  287. Obediah Winston Farm
  288. Oberg-Metcalf House
  289. Oberlin College
  290. Oberlin station
  291. Obidiah Dingee House
  292. Obion County Courthouse
  293. Obion Mounds
  294. Obligation (Harwood, Maryland)
  295. Oblong Friends Meeting House
  296. Observatory Hill Mound Group
  297. Observatory Historic District
  298. Observer Building
  299. Obsidian Cliff
  300. Obsidian Cliff Kiosk
  301. Ocala Historic Commercial District
  302. Ocala Historic District
  303. Ocala Union Station
  304. Occidental Life Building
  305. Occidental Life Insurance Company Building
  306. Occoneechee Speedway
  307. Occoquan Historic District
  308. Occum Hydroelectric Plant and Dam
  309. Ocean City 34th Street Station
  310. Ocean City City Hall
  311. Ocean City Life-Saving Station (New Jersey)
  312. Ocean City Residential Historic District
  313. Ocean City Tenth Street Station
  314. Ocean County Courthouse
  315. Ocean Drive Historic District
  316. Ocean Forest Country Club
  317. Ocean Grove, New Jersey
  318. Ocean Hall
  319. Ocean Park Historic Buildings
  320. Ocean Parkway (Brooklyn)
  321. Ocean Parkway Jewish Center
  322. Ocean Parkway station
  323. Ocean Road Historic District
  324. Ocean Spray Hotel
  325. Ocean Wave (shipwreck)
  326. Ocean to Ocean Bridge
  327. Oceana Neighborhood Historic District
  328. Oceanside City Hall and Fire Station
  329. Ochee Spring Quarry
  330. Ochlocknee Missionary Baptist Church and Cemetery
  331. Ochre Point–Cliffs Historic District
  332. Ocilla Public School
  333. Ocmulgee Mounds National Historical Park
  334. Ocoee Christian Church (Ocoee, Florida)
  335. Ocoee Dam No. 1
  336. Ocoee Dam No. 2
  337. Ocoee Dam No. 3
  338. Ocoee Street Historic District
  339. Oconaluftee (Great Smoky Mountains)
  340. Oconaluftee Baptist Church
  341. Oconee County Cage
  342. Oconee County Courthouse (1956)
  343. Oconee Hill Cemetery
  344. Oconee State Park
  345. Oconee Station State Historic Site
  346. Oconee Street School
  347. Oconomowoc station
  348. Oconto County Courthouse
  349. Ocqueoc Falls Highway–Ocqueoc River Bridge
  350. Ocqueoc Outdoor Center
  351. Ocracoke Historic District
  352. Ocracoke Light
  353. Octagon Barn, Otter Township
  354. Octagon Barn, Richland Township
  355. Octagon Building (Santa Cruz, California)
  356. Octagon Cottage (Rocky Hill, Kentucky)
  357. Octagon Hall
  358. Octagon House (Barrington, Illinois)
  359. Octagon House (Columbus, Georgia)
  360. Octagon House (Danbury, Connecticut)
  361. Octagon House (Fond du Lac, Wisconsin)
  362. Octagon House (Laurens, South Carolina)
  363. Octagon House (Reading, Massachusetts)
  364. Octagon House (Stamford, Connecticut)
  365. Octagon House (Watertown, Wisconsin)
  366. Octagon House (Westfield, Massachusetts)
  367. Octagon Round Barn, Indian Creek Township
  368. Octagon Stone Schoolhouse
  369. Octagonal Poultry House
  370. Octagonal Schoolhouse (Cowgill's Corner, Delaware)
  371. Octagonal Schoolhouse (Essex, New York)
  372. Octonia Stone
  373. Octorara Farm
  374. Odalmelech
  375. Odd Fellows Block (Afton, Iowa)
  376. Odd Fellows Block (Grand Forks, North Dakota)
  377. Odd Fellows Block (Lewiston, Maine)
  378. Odd Fellows Building (Casper, Wyoming)
  379. Odd Fellows Building (Gary, South Dakota)
  380. Odd Fellows Building (Malden, Massachusetts)
  381. Odd Fellows Building (Owensboro, Kentucky)
  382. Odd Fellows Building (Pikeville, Kentucky)
  383. Odd Fellows Building (Portland, Oregon)
  384. Odd Fellows Building (Raleigh, North Carolina)
  385. Odd Fellows Building (Red Bluff, California)
  386. Odd Fellows Building and Auditorium
  387. Odd Fellows Cemetery (Starkville, Mississippi)
  388. Odd Fellows Hall (Alexandria, Virginia)
  389. Odd Fellows Hall (Baltimore, 1891)
  390. Odd Fellows Hall (Beaver, Utah)
  391. Odd Fellows Hall (Big Horn, Wyoming)
  392. Odd Fellows Hall (Blacksburg, Virginia)
  393. Odd Fellows Hall (Cambridge, Massachusetts)
  394. Odd Fellows Hall (Covington, Kentucky)
  395. Odd Fellows Hall (Eureka, California)
  396. Odd Fellows Hall (Gonzales, California)
  397. Odd Fellows Hall (Hilliard, Ohio)
  398. Odd Fellows Hall (La Grange, California)
  399. Odd Fellows Hall (Monticello, Iowa)
  400. Odd Fellows Hall (New York City)
  401. Odd Fellows Hall (Portsmouth, Ohio)
  402. Odd Fellows Hall (Salmon, Idaho)
  403. Odd Fellows Hall (Sandusky, Ohio)
  404. Odd Fellows Hall (Santa Ana, California)
  405. Odd Fellows Hall (Troy Mills, Iowa)
  406. Odd Fellows Home District
  407. Odd Fellows Home of Dell Rapids
  408. Odd Fellows Lodge (Bel Air, Maryland)
  409. Odd Fellows Lodge (Goldsboro, North Carolina)
  410. Odd Fellows Lodge and Temple
  411. Odd Fellows Opera Block
  412. Odd Fellows Rest Cemetery
  413. Odd Fellows Temple (East Liverpool, Ohio)
  414. Odd Fellows Temple (Lexington, Kentucky)
  415. Odd Fellows Temple (Pasadena, California)
  416. Odd Fellows Valley Lodge No. 189 Building
  417. Odd Fellows and Confederate Cemetery
  418. Odd Fellows' Cemetery Mound
  419. Odd Fellows' Hall (Beverly, Massachusetts)
  420. Odd Fellows' Hall (Buckland, Massachusetts)
  421. Odd Fellows' Home (Worcester, Massachusetts)
  422. Odd Fellows' Home for Orphans, Indigent and Aged
  423. Odd Fellows-Rebekah Hall (Cornish, Maine)
  424. Oddfellows Building
  425. Oddfellows Hall (Auburn, California)
  426. Oddfellows Hall (Fairbanks, Alaska)
  427. Oddfellows' Hall (East Providence, Rhode Island)
  428. Odell Building
  429. Odell House
  430. Odell-Locke-Randolph Cotton Mill
  431. Odeon Theater (Tucumcari, New Mexico)
  432. Odessa Historic District
  433. Odessa Ice Cream Company Building
  434. Oeldorf Building
  435. Oella, Maryland
  436. Oesterlein Machine Company-Fashion Frocks, Inc. Complex
  437. Off-the-Neck Historic District
  438. Offerman Building
  439. Office Bridge
  440. Office Hall
  441. Officers Quarters, Washington Navy Yard
  442. Officers Row
  443. Officers' Row Historic District
  444. Offshore Reefs Archeological District
  445. Offutt Covered Bridge
  446. Oficina de Telégrafo y Teléfono
  447. Ogden Apartment Hotel
  448. Ogden High School
  449. Ogden House (Swarthmore, Pennsylvania)
  450. Ogden Theatre
  451. Ogden-Fettie Site
  452. Ogden/Weber Municipal Building
  453. Ogdensburg Armory
  454. Ogdensburg Harbor Light
  455. Ogilvie Building
  456. Ogilvie Moses Farmhouse
  457. Ogilvie Watertower
  458. Ogle County Courthouse
  459. Oglebay Hall
  460. Oglebay Park
  461. Oglesby-Conrad House
  462. Oglethorpe University
  463. Ogontz Hall
  464. Ogunquit Memorial Library
  465. Ogunquit Playhouse
  466. Ogunquit, Maine
  467. Ohave Shalom Synagogue (Woodridge, New York)
  468. Oheka Castle
  469. Ohev Sholem Synagogue (New London, Connecticut)
  470. Ohev Sholom Temple
  471. Oheyawahi-Pilot Knob
  472. Ohio Baptist General Association Headquarters
  473. Ohio Boulevard–Deming Park Historic District
  474. Ohio City, Cleveland
  475. Ohio Company Land Office
  476. Ohio Farm Bureau Federation Offices
  477. Ohio Finance Building
  478. Ohio Governor's Mansion
  479. Ohio History Center
  480. Ohio Judicial Center
  481. Ohio Military Institute
  482. Ohio Moline Plow Building
  483. Ohio National Bank
  484. Ohio National Guard Armory
  485. Ohio Oil Company Building
  486. Ohio Stadium
  487. Ohio State Normal College at Kent
  488. Ohio State Reformatory
  489. Ohio Statehouse
  490. Ohio Street Bridge
  491. Ohio Street Methodist Episcopal Church Complex
  492. Ohio Theatre (Columbus, Ohio)
  493. Ohio Theatre (Lima, Ohio)
  494. Ohio Theatre (Loudonville, Ohio)
  495. Ohio Theatre (Toledo, Ohio)
  496. Ohio University Lancaster historic bridges
  497. Ohio and Erie Canal
  498. Ohkay Owingeh, New Mexico
  499. Ohlman-Shannon House
  500. Ohringer Building
  501. Oil Capital Historic District (Tulsa, Oklahoma)
  502. Oil City Armory
  503. Oil City Downtown Commercial Historic District
  504. Oil City North Side Historic District
  505. Oil City South Side Historic District
  506. Oil Springs Methodist Church
  507. Oil and Gas Building
  508. Ojibway Fire Tower
  509. Ojo Caliente Hot Springs
  510. Ojo Caliente Hot Springs Round Barn
  511. Okahumpka Rosenwald School
  512. Okeechobee Battlefield
  513. Okehocking Historic District
  514. Oklahoma A & M College Agronomy Barn and Seed House
  515. Oklahoma City Discovery Well
  516. Oklahoma City Ford Motor Company Assembly Plant
  517. Oklahoma City National Memorial
  518. Oklahoma City University
  519. Oklahoma County Courthouse
  520. Oklahoma Judicial Center
  521. Oklahoma Natural Gas Company Building
  522. Oklahoma Odd Fellows Home at Checotah
  523. Oklahoma Presbyterian College
  524. Oklahoma Publishing Company Building
  525. Oklahoma State Capitol
  526. Okmulgee Downtown Historic District
  527. Okmulgee Public Library
  528. Okoboji Bridge
  529. Okolona (Middletown, Delaware)
  530. Okolona College
  531. Okolona Colored High School Gymnasium
  532. Ola Babcock Miller Building
  533. Olaf Lee House
  534. Olaf Stordahl Barn
  535. Olallie Lake Guard Station
  536. Olana State Historic Site
  537. Olcovich–Meyers House
  538. Old Administration Building (Bryce Canyon National Park)
  539. Old Administrative Area Historic District
  540. Old Adobe Barn
  541. Old Albany Academy Building
  542. Old Albany Post Road
  543. Old Albany Schoolhouse
  544. Old Albuquerque Municipal Airport Building
  545. Old Alexander House
  546. Old Allamakee County Courthouse (Lansing, Iowa)
  547. Old Allamakee County Courthouse (Waukon, Iowa)
  548. Old Allegany County Courthouse
  549. Old Allegheny Rows Historic District
  550. Old Alpha Tau Omega Fraternity House (Eugene, Oregon)
  551. Old Alton Bridge
  552. Old Anchorage City Hall
  553. Old Appleton Bridge
  554. Old Arkansas City High School
  555. Old Armijo School
  556. Old Armory (Williston, North Dakota)
  557. Old Asbury Methodist Church
  558. Old Ashland Post Office
  559. Old Ashton Historic District
  560. Old Athens, Alabama Main Post Office
  561. Old Athol High School
  562. Old Attleboro Post Office
  563. Old Augusta Historic Site
  564. Old Bacon Academy
  565. Old Baker County Courthouse
  566. Old Baldy (Lynch, Nebraska)
  567. Old Baltimore College of Dental Surgery
  568. Old Bank of America Building (Red Bluff, California)
  569. Old Bank of Amity
  570. Old Bank of Louisville
  571. Old Banks County Courthouse
  572. Old Baptist Parsonage (Scotch Plains, New Jersey)
  573. Old Barn (Canton, Massachusetts)
  574. Old Barnhill Building
  575. Old Barracks Museum
  576. Old Bartow County Courthouse
  577. Old Batesburg Grade School
  578. Old Batesburg-Leesville High School
  579. Old Battle Creek Post Office
  580. Old Bayfield County Courthouse
  581. Old Bayview Cemetery
  582. Old Bedford County Jail
  583. Old Beechwold Historic District
  584. Old Bell Telephone Building (Osceola, Arkansas)
  585. Old Belleair Town Hall
  586. Old Belvidere High School (Belvidere, Illinois)
  587. Old Bend High School
  588. Old Bennington High School
  589. Old Bennington Post Office
  590. Old Bennington, Vermont
  591. Old Benton-Sardis Road Bridge
  592. Old Bergen Church
  593. Old Berkeley City Hall
  594. Old Berkeley County Courthouse (South Carolina)
  595. Old Berlin High School
  596. Old Berrien County Courthouse Complex
  597. Old Berrien County Jail
  598. Old Beta Theta Pi Fraternity House
  599. Old Beth Israel Synagogue (Greenville, South Carolina)
  600. Old Bethany Church
  601. Old Bethel Methodist Church (Arkansas)
  602. Old Bethel United Methodist Church
  603. Old Billerica Road Historic District
  604. Old Bittermann Building
  605. Old Blenheim Bridge
  606. Old Bloomfield
  607. Old Bloomington High School
  608. Old Bluff Presbyterian Church
  609. Old Bnai Zion Synagogue
  610. Old Boardman Bridge
  611. Old Borges Ranch
  612. Old Bourne High School building
  613. Old Bradford County Courthouse
  614. Old Brewer High School
  615. Old Brick Church (Athens, Vermont)
  616. Old Brick Church (Bacon's Castle, Virginia)
  617. Old Brick Church (Fairfield County, South Carolina)
  618. Old Brick Church (Iowa City, Iowa)
  619. Old Brick House
  620. Old Brick House (Biloxi, Mississippi)
  621. Old Brick Post Office (Wickenburg, Arizona)
  622. Old Brick Presbyterian Church
  623. Old Brick Store
  624. Old Bridge (unincorporated community), New Jersey
  625. Old Bridgeville Fire House
  626. Old Bristol High School
  627. Old Broad Street Presbyterian Church and Cemetery
  628. Old Broadway Synagogue
  629. Old Brooklyn Fire Headquarters
  630. Old Brown's Mill School
  631. Old Brulay Plantation
  632. Old Brunswick County Courthouse (North Carolina)
  633. Old Bunnell State Bank Building
  634. Old Burying Ground (Beaufort, North Carolina)
  635. Old Burying Ground (Littleton, Massachusetts)
  636. Old Burying Ground (Stoneham, Massachusetts)
  637. Old Burying Ground (Watertown, Massachusetts)
  638. Old Cadillac City Hall
  639. Old Cahokia Courthouse
  640. Old Calaboose
  641. Old Calhoun County Courthouse
  642. Old California City Hall and Fire Station
  643. Old Cambridge Baptist Church
  644. Old Cambridge Historic District
  645. Old Cambridgeport Historic District
  646. Old Camden Post Office
  647. Old Camp Verde
  648. Old Campus District, University of South Carolina
  649. Old Campus Historic District (St. Lawrence University)
  650. Old Cann Mansion House
  651. Old Cape May County Courthouse Building
  652. Old Capitol Building
  653. Old Castle (Rockport, Massachusetts)
  654. Old Castle Hall
  655. Old Catonsville High School
  656. Old Catonsville Historic District
  657. Old Cawker City Library
  658. Old Cedar Baptist Church
  659. Old Center Burying Yard
  660. Old Central
  661. Old Central Fire Station (North Little Rock, Arkansas)
  662. Old Central Fire Station (Pittsfield, Massachusetts)
  663. Old Central Grammar School
  664. Old Central High School (Kalamazoo, Michigan)
  665. Old Central High School (Pittsfield, Massachusetts)
  666. Old Centre Historic District
  667. Old Challis Historic District
  668. Old Chapel (Amherst, Massachusetts)
  669. Old Chapel (Millwood, Virginia)
  670. Old Chapel Church
  671. Old Chapel Hall
  672. Old Chapel Hill Cemetery
  673. Old Chappaqua Historic District
  674. Old Charles Town Historic District
  675. Old Chattahoochee County Courthouse
  676. Old Cheboygan County Courthouse
  677. Old Chelmsford Garrison House
  678. Old Chestnut Hill Historic District
  679. Old Chicago Main Post Office
  680. Old Chief Joseph Gravesite
  681. Old China Trail
  682. Old Chiswell Place
  683. Old Christ Church (Bethel, Vermont)
  684. Old Christ Church (Laurel, Delaware)
  685. Old Christ Church (Pensacola, Florida)
  686. Old Christiansburg Industrial Institute
  687. Old Churchyard Cemetery
  688. Old Citrus County Courthouse
  689. Old City Cemetery (Columbus, Georgia)
  690. Old City Cemetery (Lynchburg, Virginia)
  691. Old City Hall (Boston)
  692. Old City Hall (Davenport, Iowa)
  693. Old City Hall (Fairbanks, Alaska)
  694. Old City Hall (Gilroy, California)
  695. Old City Hall (Knoxville)
  696. Old City Hall (Lancaster, Pennsylvania)
  697. Old City Hall (Mobile, Alabama)
  698. Old City Hall (Richmond, Virginia)
  699. Old City Hall (St. Charles, Missouri)
  700. Old City Hall (Tacoma, Washington)
  701. Old City Hall (Williamsport, Pennsylvania)
  702. Old City Hall Historic District
  703. Old City Hall and Engine House
  704. Old City Road Stone Arch Bridge
  705. Old City Waterworks
  706. Old City, Philadelphia
  707. Old Clarke County Courthouse (Virginia)
  708. Old Clarksville site
  709. Old Classroom Building, Union College
  710. Old Clay County Courthouse (West Virginia)
  711. Old Clifty Church
  712. Old Clinch County Jail
  713. Old Clinton Historic District
  714. Old Clock at Zion's First National Bank
  715. Old Clovis Post Office
  716. Old Cochecton Cemetery
  717. Old Cochrane Road Bridge
  718. Old College Hill Post Office
  719. Old College Historic District
  720. Old Colleton County Jail
  721. Old Collier County Courthouse
  722. Old Colony Cove Site
  723. Old Colony House
  724. Old Colony Iron Works-Nemasket Mills Complex
  725. Old Colorado City
  726. Old Conemaugh Borough Historic District
  727. Old Congregational Church (North Scituate, Rhode Island)
  728. Old Constitution House
  729. Old Cony High School
  730. Old Corinth Cemetery
  731. Old Corner Bookstore
  732. Old Cortez High School
  733. Old County Courthouse
  734. Old County Road South Historic District
  735. Old Courthouse (Buena Vista, Virginia)
  736. Old Courthouse Square (Lake Providence, Louisiana)
  737. Old Covered Bridge
  738. Old Crawfordsville High School
  739. Old Croton Dam
  740. Old Curtisville Historic District
  741. Old Custom House (Cairo, Illinois)
  742. Old Custom House (Monterey, California)
  743. Old Custom House (Yorktown, Virginia)
  744. Old Customs House (Knoxville, Tennessee)
  745. Old Customshouse (Erie, Pennsylvania)
  746. Old Customshouse (Wilmington, Delaware)
  747. Old Danish Church
  748. Old Dauphin Way Historic District
  749. Old Davidson County Courthouse (North Carolina)
  750. Old DeLand Memorial Hospital
  751. Old Deerfield Center Historic District
  752. Old Deerfield School
  753. Old Deery Inn
  754. Old Delta Democrat Times Building
  755. Old Denton
  756. Old Depot Museum
  757. Old Dillard High School
  758. Old District 10 Schoolhouse
  759. Old Donation Episcopal Church
  760. Old Douglas Center Historic District
  761. Old Dowlin Mill
  762. Old Downtown Des Moines Library
  763. Old Downtown Harrisburg Commercial Historic District
  764. Old Drawyers Church
  765. Old Dry Road
  766. Old DuPage County Courthouse
  767. Old Durand High School
  768. Old Dutch Church (Kingston, New York)
  769. Old Dutch Church Parsonage
  770. Old Dutch Church of Sleepy Hollow
  771. Old Dutch Parsonage
  772. Old Eagle Tavern
  773. Old East
  774. Old East Baltimore Historic District
  775. Old East Boston High School
  776. Old East Haven High School
  777. Old East Historic District
  778. Old East Paint Creek Lutheran Church
  779. Old Ebenezer Church
  780. Old Economy Village
  781. Old Eddyville Historic District
  782. Old Effingham County Courthouse
  783. Old Elm Spring Colony, South Dakota
  784. Old Engine Company 26 (Washington, D.C.)
  785. Old Engine Company No. 6
  786. Old Enon Road Stone Arch Culvert
  787. Old Episcopal Manse
  788. Old Essex County Jail
  789. Old Executive Mansion
  790. Old Faithful Historic District
  791. Old Faithful Inn
  792. Old Farm
  793. Old Farm Schoolhouse
  794. Old Fauquier County Jail
  795. Old Federal Building (Anchorage)
  796. Old Federal Building (Fairbanks, Alaska)
  797. Old Federal Building (Sault Ste. Marie)
  798. Old Federal Reserve Bank Building (Philadelphia)
  799. Old Federal Reserve Bank Building (San Francisco)
  800. Old Fellwock Auto Company
  801. Old Fernald-Laughton Memorial Hospital
  802. Old Finnish Lutheran Church
  803. Old Fire Engine House
  804. Old Fire House
  805. Old Fire House No. 4 (Kalamazoo, Michigan)
  806. Old Fire Station (Chester, Illinois)
  807. Old First Church (Huntington, New York)
  808. Old First Methodist Episcopal Church South
  809. Old First National Bank of Prineville
  810. Old First National Bank of Punta Gorda
  811. Old First Presbyterian Church (Kosciusko, Mississippi)
  812. Old First Presbyterian Church (Newark, Delaware)
  813. Old First Presbyterian Church (Newark, New Jersey)
  814. Old First Presbyterian Church (Wilmington, Delaware)
  815. Old First Reformed Church (Brooklyn)
  816. Old Florence Water Tower
  817. Old Ford Dairy
  818. Old Forge Farm
  819. Old Forge Farm (Middletown, Virginia)
  820. Old Fort (Miami, Missouri)
  821. Old Fort Bliss
  822. Old Fort Braden School
  823. Old Fort Church
  824. Old Fort Commercial Historic District
  825. Old Fort Harrod State Park
  826. Old Fort House (Columbus, Mississippi)
  827. Old Fort House (Fort Edward, New York)
  828. Old Fort Johnson
  829. Old Fort Madison High School
  830. Old Fort Park Archeological Site
  831. Old Fort Park and Golf Course
  832. Old Fort Pierce City Hall
  833. Old Fort Pierce Park
  834. Old Fort Pierce Post Office
  835. Old Fourth Ward Historic District
  836. Old Fourth Ward Southeast Historic District
  837. Old Frankfort Stone High School
  838. Old Franklin United Brethren Church
  839. Old Fremont Post Office
  840. Old Fresno Water Tower
  841. Old Friends Archeological Site
  842. Old Friendship United Methodist Church
  843. Old Frio County Jail
  844. Old Frostproof High School
  845. Old Gaissert Homeplace
  846. Old Garfield School (Salem, Oregon)
  847. Old Garrard County Jail
  848. Old Garrison House
  849. Old Georgetown City Hall
  850. Old Georgetown Road (Charleston County, South Carolina)
  851. Old Gerald School
  852. Old German Baptist Brethren Church (Winston-Salem)
  853. Old Germantown Academy and Headmasters' Houses
  854. Old Gillett Jail
  855. Old Glen Cove Post Office
  856. Old Gothic Barns
  857. Old Goucher College Buildings
  858. Old Government House (Augusta, Georgia)
  859. Old Governor's Mansion (Frankfort, Kentucky)
  860. Old Governor's Mansion (Milledgeville, Georgia)
  861. Old Grace Episcopal Church Rectory
  862. Old Grafton County Courthouse
  863. Old Grand Rapids Christian High School
  864. Old Grandin Library
  865. Old Gravesend Cemetery
  866. Old Gray Cemetery
  867. Old Gray County Courthouse
  868. Old Gray House
  869. Old Grayson County Courthouse and Clerk's Office
  870. Old Greencastle Historic District
  871. Old Greene County Courthouse
  872. Old Greenville (23WE637)
  873. Old Greenwich station
  874. Old Greenwood Cemetery
  875. Old Greenwood High School
  876. Old Grist Mill
  877. Old Guaranty Bank Building
  878. Old Gym (Vanderbilt University)
  879. Old Haines City National Guard Armory
  880. Old Hall County Courthouse (Georgia)
  881. Old Hamilton County Jail
  882. Old Hamilton Library
  883. Old Hampden Academy Building
  884. Old Hancock Central High School
  885. Old Hancock County Buildings
  886. Old Hanover High School
  887. Old Hansen Planetarium
  888. Old Harbor Historic District
  889. Old Harbor Reservation Parkways
  890. Old Harbor U.S. Life Saving Station
  891. Old Hardy County Courthouse
  892. Old Harrison County Courthouse (Iowa)
  893. Old Harrison County Courthouse (Texas)
  894. Old Hartwick Village Cemetery
  895. Old Hattiesburg High School
  896. Old Hawleyton Methodist Episcopal Church
  897. Old Headquarters Area Historic District
  898. Old Heidelberg Apartments
  899. Old Hemlock
  900. Old Hendry County Courthouse
  901. Old Hernando Elementary School
  902. Old Hickman Historic District
  903. Old Hickory United Methodist Church
  904. Old Higgins Farm Windmill
  905. Old High Middle School (Bentonville, Arkansas)
  906. Old Highway 16 Bridge
  907. Old Hill Place Bridge
  908. Old Holy Redeemer Catholic Church
  909. Old Homer Village Historic District
  910. Old Homestead (Aberdeen, Mississippi)
  911. Old Homestead (Enon Valley, Pennsylvania)
  912. Old Hoopes School
  913. Old Horry County Courthouse
  914. Old Hose House
  915. Old Hotel (Dumfries, Virginia)
  916. Old House (Cutchogue)
  917. Old House Plantation
  918. Old Huntington High School
  919. Old Huntington Jail
  920. Old Idaho State Penitentiary
  921. Old Indian Cemetery
  922. Old Indian Meeting House
  923. Old Indian River County Courthouse
  924. Old Indiana County Courthouse
  925. Old Indiana County Jail and Sheriff's Office
  926. Old Indianapolis City Hall
  927. Old Irion County Courthouse
  928. Old Iron County Courthouse
  929. Old Irontown, Utah
  930. Old Iroquois County Courthouse
  931. Old Isle of Wight Courthouse
  932. Old Jacoby Creek School
  933. Old Jail (Barnstable, Massachusetts)
  934. Old Jail (Gordo, Alabama)
  935. Old Jail (Muscatine, Iowa)
  936. Old Jail (Washington, Georgia)
  937. Old Jefferson Parish Courthouse
  938. Old Jeffersonville Historic District
  939. Old Joe (Norfork, Arkansas)
  940. Old Judy Church
  941. Old Kennebunk High School
  942. Old Kennett Meetinghouse
  943. Old Kentuck
  944. Old Kentucky Turnpike Historic District
  945. Old Killingly High School
  946. Old King's Highway Historic District
  947. Old Kingsport Presbyterian Church
  948. Old LSU Site
  949. Old La Grange Schoolhouse
  950. Old Ladore School
  951. Old Lafayette City Hall
  952. Old Lake County Courthouse (California)
  953. Old Lake County Courthouse (Florida)
  954. Old Lake Worth City Hall
  955. Old Lakeland High School
  956. Old Las Vegas Mormon Fort State Historic Park
  957. Old Laurel High School
  958. Old Lee County Courthouse
  959. Old Lehigh County Courthouse
  960. Old Lenox High School building
  961. Old Library (Bryn Mawr College)
  962. Old Library Building (Chattanooga, Tennessee)
  963. Old Library Building (Maysville, Kentucky)
  964. Old Linn County Jail
  965. Old Little Rock Central Fire Station
  966. Old Live Oak City Hall
  967. Old Livery Stable
  968. Old Livingston Parish Courthouse
  969. Old Lock Pump House, Chesapeake & Delaware Canal
  970. Old Log Church
  971. Old Logan County Courthouse (Kansas)
  972. Old Logan County Jail
  973. Old Lone Star Brewery
  974. Old Lordsburg High School
  975. Old Lorimier Cemetery
  976. Old Louisiana Governor's Mansion
  977. Old Louisiana State Capitol
  978. Old Louisville
  979. Old Lucerne Historic Residential District
  980. Old Lutheran Parsonage
  981. Old Lutz Elementary School
  982. Old Lyford High School
  983. Old Lyme Historic District
  984. Old Lynn High School
  985. Old M-94–Au Train River Bridge
  986. Old M-95–Michigamme River Bridge
  987. Old Mackinac Point Light
  988. Old Madison County Courthouse
  989. Old Maid's Orchard Mound
  990. Old Main (Arizona State University)
  991. Old Main (Augsburg University)
  992. Old Main (Bethany College)
  993. Old Main (California University of Pennsylvania)
  994. Old Main (Dakota College at Bottineau)
  995. Old Main (Eastern Illinois University)
  996. Old Main (Franklin College)
  997. Old Main (Iowa Wesleyan University)
  998. Old Main (Marshall University)
  999. Old Main (Minnesota State University, Mankato)
  1000. Old Main (Nicholas County High School)
  1001. Old Main (North Park University)
  1002. Old Main (Texas State University)
  1003. Old Main (University of Arkansas)
  1004. Old Main (University of North Carolina at Pembroke)
  1005. Old Main (University of South Dakota)
  1006. Old Main (University of Wyoming)
  1007. Old Main (Utah State University)
  1008. Old Main (Wartburg College)
  1009. Old Main Street Historic District (Dubuque, Iowa)
  1010. Old Main Street Historic District (Racine, Wisconsin)
  1011. Old Main and Chemistry Building
  1012. Old Main at the Lutheran Home at Topton
  1013. Old Main, Augustana College
  1014. Old Main, Goethean Hall, and Diagnothian Hall
  1015. Old Main, Knox College
  1016. Old Main, Nebraska Wesleyan University
  1017. Old Main, Suomi College
  1018. Old Main, University of Arizona
  1019. Old Man House
  1020. Old Manatee County Courthouse
  1021. Old Mandan High School
  1022. Old Mansion
  1023. Old Marengo County Courthouse
  1024. Old Marion County Courthouse (Georgia)
  1025. Old Market (Louisville, Georgia)
  1026. Old Market (Omaha, Nebraska)
  1027. Old Market Building (Georgetown, South Carolina)
  1028. Old Market House (Galena, Illinois)
  1029. Old Martin County Courthouse
  1030. Old Masonic Hall (Bellville, Texas)
  1031. Old Masonic Hall (Benicia, California)
  1032. Old Masonic Hall (Louisville, Mississippi)
  1033. Old Masonic Temple (Marshall, Minnesota)
  1034. Old Mauch Chunk Historic District
  1035. Old McCulloch County Jail
  1036. Old McDonald County Courthouse
  1037. Old McHenry County Courthouse
  1038. Old McKenzie Fish Hatchery
  1039. Old McKinley High School
  1040. Old Medford High School
  1041. Old Medical College
  1042. Old Meigs County Courthouse
  1043. Old Merchants and Farmers Bank Building
  1044. Old Methodist District Parsonage
  1045. Old Michigan Avenue School
  1046. Old Michigan City Light
  1047. Old Middletown High School
  1048. Old Middletown Post Office
  1049. Old Midtown Historic District (Harrisburg)
  1050. Old Military Road
  1051. Old Mill (West Tisbury, Massachusetts)
  1052. Old Mill House
  1053. Old Mill Road Bridge
  1054. Old Mill Site Historic District
  1055. Old Mill State Park
  1056. Old Mill at Tinton Falls
  1057. Old Miller Hospital
  1058. Old Mine Park Archeological Site
  1059. Old Mine Road Historic District
  1060. Old Minnehaha County Courthouse
  1061. Old Mishawaka Carnegie Library
  1062. Old Mission Dam
  1063. Old Mission House
  1064. Old Mission Inn
  1065. Old Mission State Park
  1066. Old Mississippi State Capitol
  1067. Old Mobile Site
  1068. Old Monroe County Courthouse
  1069. Old Monroe School House
  1070. Old Morris County Courthouse
  1071. Old Morrison Mill
  1072. Old Mt. Carmel Cemetery, Wrought-Iron Cross Site
  1073. Old Muhlenberg County Jail
  1074. Old Mulkey Meetinghouse
  1075. Old Napa Register Building
  1076. Old Narragansett Cemetery
  1077. Old Narragansett Church
  1078. Old Nassau County Courthouse (New York)
  1079. Old Natchez Trace segments listed on the National Register of Historic Places
  1080. Old National Park Service Housing Historic District
  1081. Old National Pike Milestones
  1082. Old Naval Hospital
  1083. Old Naval Observatory
  1084. Old Nazareth Academy
  1085. Old Nebraska State Bank Building
  1086. Old Neck Historic District
  1087. Old Neighborhoods Historic District
  1088. Old New England Building
  1089. Old New York Evening Post Building
  1090. Old New-Gate Prison
  1091. Old Newark Comprehensive School
  1092. Old Newberry County Courthouse
  1093. Old Newburgh Presbyterian Church
  1094. Old Nicolet High School
  1095. Old Nogales City Hall and Fire Station
  1096. Old Norfolk City Hall
  1097. Old Norriton Presbyterian Church
  1098. Old North Carolina Mutual Life Insurance Company Building
  1099. Old North Cemetery (Concord, New Hampshire)
  1100. Old North Cemetery (Hartford, Connecticut)
  1101. Old North Cemetery (Portsmouth, New Hampshire)
  1102. Old North Cemetery (Truro, Massachusetts)
  1103. Old North Church
  1104. Old North End Historic District (Colorado Springs, Colorado)
  1105. Old North End Historic District (Columbus, Ohio)
  1106. Old North Knoxville
  1107. Old North Tower, University of Central Oklahoma
  1108. Old Northside Historic District
  1109. Old Northwood Historic District
  1110. Old Nueces County Courthouse
  1111. Old Oak
  1112. Old Ohavi Zedek Synagogue
  1113. Old Orange County Courthouse (California)
  1114. Old Orange County Courthouse (North Carolina)
  1115. Old Orchard Beach Inn
  1116. Old Orchard Shoal Light
  1117. Old Oxford Mill
  1118. Old Ozaukee County Courthouse
  1119. Old Palm Beach Junior College Building
  1120. Old Palmetto Hotel
  1121. Old Parsonage
  1122. Old Pasadena
  1123. Old Pascagoula High School
  1124. Old People's Home (Omaha)
  1125. Old People's Home (Tampa, Florida)
  1126. Old Perry County Courthouse (Rome, Indiana)
  1127. Old Perry Post Office
  1128. Old Petaluma Opera House
  1129. Old Philadelphia Presbyterian Church
  1130. Old Pickens Jail
  1131. Old Pickens Presbyterian Church
  1132. Old Piedras River Aqueduct
  1133. Old Pike Inn
  1134. Old Pilgrim Baptist Church Cemetery and Kilgore Family Cemetery
  1135. Old Pine Church
  1136. Old Pine Street Station
  1137. Old Pinecrest Hotel
  1138. Old Pinellas County Courthouse
  1139. Old Piqua High School
  1140. Old Plat Historic District
  1141. Old Platte Clove Post Office
  1142. Old Plover Methodist Church
  1143. Old Point Comfort Light
  1144. Old Point Loma Lighthouse
  1145. Old Police Headquarters
  1146. Old Polk County Courthouse (Florida)
  1147. Old Port Columbus Terminal
  1148. Old Port of Portland, Maine
  1149. Old Portlock School No. 5
  1150. Old Post Office (Albany, New York)
  1151. Old Post Office (Albuquerque, New Mexico)
  1152. Old Post Office (Augusta, Maine)
  1153. Old Post Office (Biddeford, Maine)
  1154. Old Post Office (Buffalo, New York)
  1155. Old Post Office (Hot Springs, Arkansas)
  1156. Old Post Office (Iowa City, Iowa)
  1157. Old Post Office (Kirkwood, Delaware)
  1158. Old Post Office (Liberty, Maine)
  1159. Old Post Office (Oneonta, New York)
  1160. Old Post Office (Pullman, Washington)
  1161. Old Post Office (Rogers, Arkansas)
  1162. Old Post Office (Washington, D.C.)
  1163. Old Post Office (Watertown, South Dakota)
  1164. Old Post Office Block
  1165. Old Post Office Building (Brockton, Massachusetts)
  1166. Old Post Office Building (Lynn, Massachusetts)
  1167. Old Post Office Building and Customhouse (Little Rock, Arkansas)
  1168. Old Post Office and Courthouse (Auburn, New York)
  1169. Old Post Office and Customshouse (Key West, Florida)
  1170. Old Pottstown Historic District
  1171. Old Poughkeepsie YMCA
  1172. Old Presbyterian Church (Barnwell, South Carolina)
  1173. Old Presbyterian Church (Parker, Arizona)
  1174. Old Presbyterian Meeting House
  1175. Old Presque Isle Light
  1176. Old Prince Edward County Clerk's Office
  1177. Old Probst Church
  1178. Old Providence Church
  1179. Old Providence Presbyterian Church
  1180. Old Providence Stone Church
  1181. Old Public Library
  1182. Old Quaker Meeting House (Queens)
  1183. Old Queens
  1184. Old Randolph County Courthouse (Arkansas)
  1185. Old Rectory (Perrowville, Virginia)
  1186. Old Red Mill
  1187. Old Red Mill and Mill House
  1188. Old Redfield City Hall
  1189. Old Redwater Bridge
  1190. Old Richmond Historic District
  1191. Old Richmond Schoolhouse and Gymnasium
  1192. Old River Bridge
  1193. Old Riverton Inn
  1194. Old Roanoke County Courthouse
  1195. Old Rock House (Harpersville, Alabama)
  1196. Old Rock House (Moscow Mills, Missouri)
  1197. Old Rock House (Thomson, Georgia)
  1198. Old Rock School (Dodgeville, Wisconsin)
  1199. Old Rock School (Guntersville, Alabama)
  1200. Old Rock School (Prairie du Chien, Wisconsin)
  1201. Old Rockport High School
  1202. Old Rockport Hutterite Colony
  1203. Old Rockville High School and East School
  1204. Old Rondo Cemetery
  1205. Old Rose Tree Tavern
  1206. Old Rotation
  1207. Old Roycemore School building
  1208. Old Runnymede Church
  1209. Old Russell County Courthouse
  1210. Old Ryan Farm
  1211. Old Saco High School
  1212. Old Sacramento State Historic Park
  1213. Old Saint Hilary's Church
  1214. Old Saint John Nepomocene Cemetery, Wrought-Iron Cross Site
  1215. Old Saint Paul's Cemetery
  1216. Old Saints Peter and Paul Cemetery, Wrought-Iron Cross Site
  1217. Old Salem
  1218. Old Salem Church and Cemetery
  1219. Old San Antonio City Cemeteries Historic District
  1220. Old San Antonio Hospital
  1221. Old San Francisco Mint
  1222. Old San Juan
  1223. Old Santa Rosa Catholic Church and Cemetery
  1224. Old Santa Susana Stage Road
  1225. Old Saratoga Reformed Church
  1226. Old Sardinia Town Hall
  1227. Old Savonoski Site
  1228. Old Saybrook South Green
  1229. Old Scarborough High School
  1230. Old School Baptist Church and Cemetery
  1231. Old School Baptist Church of Halcottsville
  1232. Old School House (Tampa, Florida)
  1233. Old School Privy
  1234. Old School Square
  1235. Old Schoolhouse (York, Maine)
  1236. Old Schoolhouse Bridge
  1237. Old Schwamb Mill
  1238. Old Scituate Light
  1239. Old Scotch Church
  1240. Old Scots Burying Ground
  1241. Old Scott County Jail
  1242. Old Scottish Rite Hospital building
  1243. Old Scripps Building
  1244. Old Searcy County Jail
  1245. Old Sebastian County Jail
  1246. Old Second National Bank
  1247. Old Seminary Building
  1248. Old Settler's Irrigation Ditch
  1249. Old Settler's Pavilion
  1250. Old Settlers' Association Park and Rhodham Bonnifield House
  1251. Old Settlers' Association of Johnson County Cabins
  1252. Old Settlers' Burying Ground
  1253. Old Shandon Historic District
  1254. Old Shelby County Courthouse
  1255. Old Sheldon Church Ruins
  1256. Old Shephard Farm
  1257. Old Ship African Methodist Episcopal Zion Church
  1258. Old Ship Church
  1259. Old Ship Street Historic District
  1260. Old Shipbuilder's Historic District
  1261. Old Silk Stocking Neighborhood
  1262. Old Sinclair Station
  1263. Old Sitka Site
  1264. Old Slave Mart
  1265. Old Sloatsburg Cemetery
  1266. Old Somersworth High School
  1267. Old Sopchoppy High School Gymnasium
  1268. Old South Church
  1269. Old South Church (Kirtland, Ohio)
  1270. Old South Mebane Historic District
  1271. Old South Meeting House
  1272. Old South Union Church
  1273. Old Southeast Church (Brewster, New York)
  1274. Old Southeast Town Hall
  1275. Old Southport High School
  1276. Old Spanish Fort (Pascagoula, Mississippi)
  1277. Old Spanish Trail (trade route)
  1278. Old Spink Colony
  1279. Old Spring Tavern
  1280. Old Springdale High School
  1281. Old St. Anastasia Catholic School
  1282. Old St. Andrew's Episcopal Church
  1283. Old St. Andrew's Parish Church
  1284. Old St. Anthony's Catholic Church (Violet, Texas)
  1285. Old St. Ferdinand Shrine
  1286. Old St. Gabriel's Episcopal Church
  1287. Old St. Helena Parish Jail
  1288. Old St. Johns County Jail
  1289. Old St. Joseph Hospital
  1290. Old St. Joseph's Catholic Church
  1291. Old St. Luke's Episcopal Church (Belton, Texas)
  1292. Old St. Luke's Hospital
  1293. Old St. Mary's Catholic Parish House
  1294. Old St. Mary's Cemetery, Wrought-Iron Cross Site
  1295. Old St. Mary's Church (Cincinnati, Ohio)
  1296. Old St. Mary's Church (Milwaukee, Wisconsin)
  1297. Old St. Mary's Church (Tempe, Arizona)
  1298. Old St. Nicholas Russian Orthodox Church
  1299. Old St. Patrick's Church (Chicago)
  1300. Old St. Patrick's Church (Gravois Mills, Missouri)
  1301. Old St. Paul's Methodist Episcopal Church
  1302. Old St. Peter's Church (Van Cortlandtville, New York)
  1303. Old St. Peter's Landmark
  1304. Old St. Raymond's Church
  1305. Old St. Teresa Catholic Church
  1306. Old St. Wenceslaus Catholic Parish House
  1307. Old Stagecoach Stop
  1308. Old State Bank (Decatur, Alabama)
  1309. Old State Bank (Vincennes, Indiana)
  1310. Old State Capitol (Kentucky)
  1311. Old State Capitol (Milledgeville, Georgia)
  1312. Old State Capitol State Historic Site
  1313. Old State House (Boston)
  1314. Old State House (Connecticut)
  1315. Old State House (Dover, Delaware)
  1316. Old State House (Little Rock, Arkansas)
  1317. Old State House (Providence, Rhode Island)
  1318. Old State Mutual Building
  1319. Old State Quarry State Preserve
  1320. Old State Road Bridge
  1321. Old Statehouse Historic District (Frankfort, Kentucky)
  1322. Old Stone Arch (Marshall, Illinois)
  1323. Old Stone Arch Bridge (Bound Brook, New Jersey)
  1324. Old Stone Arch Bridge (Clark Center, Illinois)
  1325. Old Stone Arch Bridge (Lewistown, Pennsylvania)
  1326. Old Stone Barracks
  1327. Old Stone Blacksmith Shop
  1328. Old Stone Church (Buffalo, North Dakota)
  1329. Old Stone Church (Chesterfield, Missouri)
  1330. Old Stone Church (Cleveland, Ohio)
  1331. Old Stone Church (Kingwood Township, New Jersey)
  1332. Old Stone Church (Lewisburg, West Virginia)
  1333. Old Stone Church (West Boylston, Massachusetts)
  1334. Old Stone Church (White Hall, Virginia)
  1335. Old Stone Church (Winchester, Virginia)
  1336. Old Stone Church Archeological Site
  1337. Old Stone Church and Cemetery
  1338. Old Stone Congregational Church
  1339. Old Stone Fort (Schoharie, New York)
  1340. Old Stone Fort (Tennessee)
  1341. Old Stone Hotel
  1342. Old Stone House (Brooklyn)
  1343. Old Stone House (Millboro Springs, Virginia)
  1344. Old Stone House (Morgantown, West Virginia)
  1345. Old Stone House (Pennsboro, West Virginia)
  1346. Old Stone House (Vale, Oregon)
  1347. Old Stone House (Washington, D.C.)
  1348. Old Stone House (Winnsboro, South Carolina)
  1349. Old Stone House (Winooski, Vermont)
  1350. Old Stone House Library
  1351. Old Stone Row
  1352. Old Stone Shop
  1353. Old Stone Tavern (Atkins, Virginia)
  1354. Old Stone Tavern (Frankfort, Kentucky)
  1355. Old Stone Tavern (Little Creek, Delaware)
  1356. Old Stone Tavern (Moorefield, West Virginia)
  1357. Old Stone Warehouse (Rochester, New York)
  1358. Old Stone Wharf Archeological Site
  1359. Old Storm Lake High School
  1360. Old Strother Place
  1361. Old Sugar Mill of Koloa
  1362. Old Sullivan County Courthouse
  1363. Old Sussex County Courthouse
  1364. Old Sutton High School
  1365. Old Talbott Tavern
  1366. Old Tampa Children's Home
  1367. Old Tarpon Springs City Hall
  1368. Old Tarpon Springs High School
  1369. Old Tavern (Burlington, Maine)
  1370. Old Tavern (Sacramento, California)
  1371. Old Tavern Farm
  1372. Old Taylor County Jail
  1373. Old Thames Shipyard
  1374. Old Third District Courthouse
  1375. Old Thomas James Store
  1376. Old Timbers
  1377. Old Todd County Courthouse
  1378. Old Tombstone
  1379. Old Town (Franklin, Tennessee)
  1380. Old Town Bridge (Franklin, Tennessee)
  1381. Old Town Bridge (Wayland, Massachusetts)
  1382. Old Town Cemetery (Newburgh, New York)
  1383. Old Town Center Historic District
  1384. Old Town College Park
  1385. Old Town Eureka
  1386. Old Town Farm
  1387. Old Town Fort Collins
  1388. Old Town Friends' Meetinghouse
  1389. Old Town Green Historic District
  1390. Old Town Hall (Athol, Massachusetts)
  1391. Old Town Hall (Chester, Connecticut)
  1392. Old Town Hall (Pittsfield, Massachusetts)
  1393. Old Town Hall (Stamford, Connecticut)
  1394. Old Town Hall (Tyngsborough, Massachusetts)
  1395. Old Town Hall (Wilmington, Delaware)
  1396. Old Town Hall Historic District (Duxbury, Massachusetts)
  1397. Old Town Hall Historic District (Huntington, New York)
  1398. Old Town Hall and School
  1399. Old Town Historic District (Ames, Iowa)
  1400. Old Town Historic District (Clearfield, Pennsylvania)
  1401. Old Town Historic District (Harrisonburg, Virginia)
  1402. Old Town Historic District (Hartford, Kentucky)
  1403. Old Town Historic District (Huntsville, Alabama)
  1404. Old Town Historic District (North Attleborough, Massachusetts)
  1405. Old Town Historic District (Selma, Alabama)
  1406. Old Town House (Marblehead, Massachusetts)
  1407. Old Town House (Parsonsfield, Maine)
  1408. Old Town House (Union, Maine)
  1409. Old Town Main Post Office
  1410. Old Town Manassas
  1411. Old Town Plantation
  1412. Old Town Residential Historic District (Las Vegas, New Mexico)
  1413. Old Town San Diego State Historic Park
  1414. Old Town Savings Bank
  1415. Old Town Sebastian Historic District, East
  1416. Old Town Sebastian Historic District, West
  1417. Old Town of Flushing Burial Ground
  1418. Old Town, Chicago
  1419. Old Town, Lansing, Michigan
  1420. Old Towne, Orange Historic District
  1421. Old Trail School (Wiggins, Colorado)
  1422. Old Trails Bridge
  1423. Old Trees
  1424. Old Turner Place
  1425. Old Turrell City Hall
  1426. Old U.S. Forest Products Laboratory
  1427. Old U.S. Post Office (Bend, Oregon)
  1428. Old U.S. Post Office (Marion, Ohio)
  1429. Old U.S. Post Office (Niles, Michigan)
  1430. Old U.S. Post Office (Ripley, Mississippi)
  1431. Old U.S. Post Office (Williston, North Dakota)
  1432. Old U.S. Route 79 (Kingsland, Arkansas)
  1433. Old US 41–Backwater Creek Bridge
  1434. Old US 67 Rest Area
  1435. Old Union Church and Cemetery
  1436. Old Union County Courthouse (Georgia)
  1437. Old Union County Courthouse (Pennsylvania)
  1438. Old Union County Jail (Blairsville, Georgia)
  1439. Old Union Depot Hotel
  1440. Old Union Meetinghouse
  1441. Old Union Methodist Church
  1442. Old Union School (Birdell, Arkansas)
  1443. Old Union School (Chesterville, Ohio)
  1444. Old Union School (Coshocton, Ohio)
  1445. Old United States Courthouse and Post Office (Frankfort, Kentucky)
  1446. Old United States Customshouse and Post Office and Fireproof Storage Company Warehouse
  1447. Old United States Post Office (Philadelphia, Mississippi)
  1448. Old United States Post Office and Courthouse (Miami, Florida)
  1449. Old United States Post Office and Courts Building (Jefferson, Texas)
  1450. Old University Library
  1451. Old University of Alabama Observatory
  1452. Old Upper Springfield Friends Burying Ground
  1453. Old Uptown Historic District (Harrisburg)
  1454. Old Urban Cemetery
  1455. Old Ursuline Convent, New Orleans
  1456. Old Vanderburgh County Courthouse
  1457. Old Vatia
  1458. Old Vero Beach Community Building
  1459. Old Vicksburg Bridge
  1460. Old Village Historic District (Chatham, Massachusetts)
  1461. Old Village Historic District (Monroe, Michigan)
  1462. Old WRUF Radio Station
  1463. Old Wadena Historic District
  1464. Old Wakulla County Courthouse
  1465. Old Walnut Ridge Post Office
  1466. Old Wappingers Falls Village Hall
  1467. Old Warner Brothers Studio
  1468. Old Warren County Courthouse
  1469. Old Warren County Courthouse Complex
  1470. Old Warrick County Jail
  1471. Old Washington County Courthouse (Oklahoma)
  1472. Old Washington County Courthouse (Utah)
  1473. Old Washington County Library
  1474. Old Water and Electric Light Plant
  1475. Old Watertown High School
  1476. Old Waterville High School
  1477. Old Waterville Post Office
  1478. Old Watson Homestead House
  1479. Old Wayne County High School
  1480. Old Weber Implement and Automobile Company
  1481. Old Webster Meeting House
  1482. Old Webster Schoolhouse
  1483. Old Weir Stove Building
  1484. Old Welbourne Farm and Dulany Family Cemetery
  1485. Old West Austin Historic District
  1486. Old West Baltimore Historic District
  1487. Old West Church (Boston, Massachusetts)
  1488. Old West Church (Calais, Vermont)
  1489. Old West End District (Toledo, Ohio)
  1490. Old West End Historic District (Muncie, Indiana)
  1491. Old West Haven High School
  1492. Old West Palm Beach National Guard Armory
  1493. Old West Salem City Hall
  1494. Old West Side Historic District
  1495. Old West, Dickinson College
  1496. Old Westbrook High School
  1497. Old Westbury Gardens
  1498. Old Westfield Cemetery
  1499. Old Wethersfield
  1500. Old Whaler's Church (Sag Harbor)
  1501. Old White Church Cemetery
  1502. Old White County Courthouse
  1503. Old White Meeting House Ruins and Cemetery
  1504. Old White Mill
  1505. Old Wilkes County Jail
  1506. Old Willow Community Center
  1507. Old Wilson Historic District
  1508. Old Wing Mission
  1509. Old Winona Middle School
  1510. Old Winters Ranch/Winters Mansion
  1511. Old Woodruff High School (Woodruff, South Carolina)
  1512. Old World Third Street Historic District
  1513. Old Worth County Courthouse (Iowa)
  1514. Old Wye Church
  1515. Old Wythe Historic District
  1516. Old York Gaol
  1517. Old Zion Methodist Church
  1518. Olde Town Arvada
  1519. Olde Woolen Mill
  1520. Oldenburg Historic District
  1521. Oldfields
  1522. Oldham Methodist Church
  1523. Olds Hall
  1524. Olds, Wortman & King
  1525. Oldtown Covered Bridge
  1526. Oldwick Historic District
  1527. Ole Arilsen House
  1528. Ole Bohman House
  1529. Ole Carlson House
  1530. Ole Crogen Farm District
  1531. Ole K. Roe House
  1532. Ole and Polly Oleson Farmhouse
  1533. Olean Armory
  1534. Olean Public Library
  1535. Olean Railroad Depot
  1536. Olean School No. 10
  1537. Olema Lime Kilns
  1538. Olema Valley Dairy Ranches Historic District
  1539. Oleson Park Music Pavilion
  1540. Oley Township, Pennsylvania
  1541. Oliphant–Walker House
  1542. Olivas Adobe
  1543. Olive Branch High School (New Carlisle, Ohio)
  1544. Olive Branch Methodist Episcopal Church
  1545. Olive Branch Missionary Baptist Church
  1546. Olive Chapel African Methodist Episcopal Church
  1547. Olive Furnace
  1548. Olive Hill (Matoaca, Virginia)
  1549. Olive Hill station
  1550. Olive Hotel
  1551. Olive Jeanette
  1552. Olive Township District No. 1 School
  1553. Olive and Hurley Old School Baptist Church
  1554. Olivenhain Town Meeting Hall
  1555. Oliver A. Wickes House
  1556. Oliver Avenue Bridge
  1557. Oliver Barrett House
  1558. Oliver Blood House
  1559. Oliver Brewster House
  1560. Oliver Bronson House
  1561. Oliver Building (Billings, Montana)
  1562. Oliver Building (Chicago)
  1563. Oliver Chace's Thread Mill
  1564. Oliver Ellsworth Homestead
  1565. Oliver Filley House
  1566. Oliver G. Traphagen House
  1567. Oliver H. Bair Funeral Home
  1568. Oliver H. Hovda House
  1569. Oliver Hastings House
  1570. Oliver Hazard Perry Graded School
  1571. Oliver High School
  1572. Oliver Hill Building
  1573. Oliver House (Corning, Arkansas)
  1574. Oliver House (Wakefield, Massachusetts)
  1575. Oliver House, Toledo, Ohio
  1576. Oliver Hutchins House
  1577. Oliver Johnson's Woods Historic District
  1578. Oliver Kelley Farm
  1579. Oliver L. and Catherine Link House
  1580. Oliver Mill Park
  1581. Oliver Miller Homestead
  1582. Oliver O. Stokes House
  1583. Oliver P. Morton House
  1584. Oliver Rice House
  1585. Oliver Street Historic District
  1586. Oliver Sturges House
  1587. Oliver W. Mills House
  1588. Oliver Warner Farmstead
  1589. Oliver Wendell Holmes House
  1590. Oliver White Tavern
  1591. Oliver Whiting Homestead
  1592. Oliver Wight House
  1593. Oliver Wiswall House
  1594. Oliver Wolcott House
  1595. Oliver and Gertrude Lundquist House
  1596. Oliver and Lucy Bonnell Gothic Arch Roofed Barn
  1597. Oliver and Margaret Jeffrey House
  1598. Oliver's Gift (log canoe)
  1599. Oliver-Leming House
  1600. Oliver–Eakle–Barfield Building
  1601. Oliver–Morton Farm
  1602. Olivet Chapel
  1603. Olivet Presbyterian Church
  1604. Olivet United Methodist Church, Parsonage and School
  1605. Olivia Apartments
  1606. Oljato Trading Post
  1607. Ollinger-Cobb House
  1608. Olmstead Place State Park
  1609. Olmstead Street Historic District
  1610. Olmstead station
  1611. Olmsted Family Farmhouse
  1612. Olmsted Station Powerhouse
  1613. Olmsted Subdivision Historic District
  1614. Olmsted-Hixon-Albion Block
  1615. Olney (Joppa, Maryland)
  1616. Olney Carnegie Library
  1617. Olney Cook Artisan Shop
  1618. Olney Elementary School
  1619. Olney Friends School
  1620. Olney High School
  1621. Olney Street–Alumni Avenue Historic District
  1622. Olof Johnson House
  1623. Olompali State Historic Park
  1624. Olsen House (Helena, Montana)
  1625. Olson House (Cushing, Maine)
  1626. Oltjenbruns Farm
  1627. Oluf Larsen House
  1628. Olustee Battlefield Historic State Park
  1629. Olympia Apartments (Washington, D.C.)
  1630. Olympia Armory
  1631. Olympia Downtown Historic District
  1632. Olympia Fields Country Club
  1633. Olympia Mill
  1634. Olympia School
  1635. Olympia Theater (Miami)
  1636. Olympic Apartment Building
  1637. Olympic Avenue Bridge
  1638. Olympic Cereal Mill
  1639. Olympic Club Hotel
  1640. Olympic National Park Headquarters Historic District
  1641. Olympus Guard Station
  1642. Olzie Whitehead Williams House
  1643. Omaha Bolt, Nut and Screw Building
  1644. Omaha Central High School
  1645. Omaha Ford Motor Company Assembly Plant
  1646. Omaha Hotel
  1647. Omaha National Bank Building
  1648. Omaha Public Library (building)
  1649. Omaha Quartermaster Depot Historic District
  1650. Omaha Rail and Commerce Historic District
  1651. Omaha Star building
  1652. Omaha Union Station
  1653. Omaha station (Chicago, Burlington and Quincy Railroad)
  1654. Omar Chapel
  1655. Omega Chapter of the Chi Phi Fraternity
  1656. Omena Historic District
  1657. Omni Bedford Springs Resort
  1658. Omni William Penn Hotel
  1659. Omohundro Water Treatment Plant
  1660. Omro Village Hall and Engine House
  1661. On the Hill (Boydton, Virginia)
  1662. Onancock Historic District
  1663. Onawa IOOF Opera House
  1664. Onawa Public Library
  1665. Onaway State Park
  1666. Onderdonk House
  1667. One Calvert Plaza
  1668. One Charles Center
  1669. One Main Place (Dallas)
  1670. One Moody Plaza
  1671. One North LaSalle
  1672. One Pendleton Place
  1673. One Thirty North Eighth Building
  1674. One-Million-Liter Test Sphere
  1675. Oneida Armory
  1676. Oneida Community Mansion House
  1677. Oneida Cotton Mills and Scott-Mebane Manufacturing Company Complex
  1678. Oneida County Courthouse (Idaho)
  1679. Oneida County Courthouse (Wisconsin)
  1680. Oneida Lake Congregational Church
  1681. Oneida Milling and Elevator Company Grain Elevator
  1682. Oneida Stake Academy
  1683. Oneida Street Station
  1684. Oneonta Armory
  1685. Oneonta Downtown Historic District
  1686. Oneonta Theatre
  1687. Onesquethaw Valley Historic District
  1688. Ongeluluul
  1689. Onion Creek Bridge (Coffeyville, Kansas)
  1690. Onion Portage Archeological District
  1691. Onon B. and Betsy Dahle House
  1692. Onondaga Highlands–Swaneola Heights Historic District
  1693. Onondaga Park
  1694. Onota, Au Train Township, Michigan
  1695. Onslow Gilmore House
  1696. Ontario Apartments
  1697. Ontario Heritage Square
  1698. Ontario State Bank Block
  1699. Ontario and Livingston Mutual Insurance Office
  1700. Ontario station (Oregon)
  1701. Onteora Park Historic District
  1702. Ontonagon County Courthouse
  1703. Ontonagon Harbor Piers Historic District
  1704. Ontonagon Light
  1705. Ontonagon School
  1706. Onyx Cave (Newburg, Missouri)
  1707. Oolenoy Baptist Church Cemetery
  1708. Ooten House
  1709. Opa-locka Bank
  1710. Opa-locka Company administration building
  1711. Opa-locka station
  1712. Opal's Steak House
  1713. Opana Radar Site
  1714. Opatrny Village Site
  1715. Opelousas Historic District
  1716. Open Air School (Columbus, Ohio)
  1717. Opequon Golf Club
  1718. Opequon Historic District
  1719. Opequon Presbyterian Church
  1720. Opera Block
  1721. Opera Hall Block (King City, Missouri)
  1722. Opera House and Yates Bookshop Building
  1723. Opera House at Boothbay Harbor
  1724. Opera House–Starnes Jewelers Building
  1725. Operation Crossbow Site
  1726. Operation Elster
  1727. Operations and Checkout Building
  1728. Ophir Town Hall
  1729. Opp Cottage
  1730. Oppenheim and St. Johnsville Union Society Church
  1731. Opposition House
  1732. Opus 40
  1733. Oquawka Wagon Bridge
  1734. Oquirrh School
  1735. Oquossoc Log Church
  1736. Ora Adams House
  1737. Ora Blanchard House
  1738. Ora Holland House
  1739. Ora Pelton House
  1740. Oracle State Park
  1741. Oracle Union Church
  1742. Oradell station
  1743. Oraibi, Arizona
  1744. Oram Nincehelser House
  1745. Oran Community Church
  1746. Oran District No. 22 Schoolhouse
  1747. Orange Armory
  1748. Orange Center Historic District (Orange, Connecticut)
  1749. Orange Center Historic District (Orange, Massachusetts)
  1750. Orange City Historic District
  1751. Orange City Town Hall
  1752. Orange Commercial Historic District
  1753. Orange County Courthouse (Indiana)
  1754. Orange County Courthouse (Virginia)
  1755. Orange Cove station (Atchison, Topeka and Santa Fe Railway)
  1756. Orange Grove (Dalzell, South Carolina)
  1757. Orange Grove Court
  1758. Orange Grove Plantation (Saint Helena Island, South Carolina)
  1759. Orange Grove Plantation House (Terrebonne Parish, Louisiana)
  1760. Orange Hall (St. Marys, Georgia)
  1761. Orange High School (Orange, California)
  1762. Orange High School (Orange, Virginia)
  1763. Orange Mill Historic District
  1764. Orange Park Elementary School
  1765. Orange Park Negro Elementary School
  1766. Orange Public Library
  1767. Orange Springs
  1768. Orange Springs Methodist Episcopal Church and Cemetery
  1769. Orange Street Historic District
  1770. Orange Street Presbyterian Church
  1771. Orange Street School
  1772. Orange Vale
  1773. Orange and Alexandria Railroad Bridge Piers
  1774. Orange and Alexandria Railroad Hooff's Run Bridge
  1775. Orange station (NJ Transit)
  1776. Orangeburg City Cemetery
  1777. Orangeburg County Fair Main Exhibit Building
  1778. Orangeburg County Jail
  1779. Orangeburg Downtown Historic District
  1780. Orators Mound
  1781. Orchard Beach State Park
  1782. Orchard House
  1783. Orchard Park station
  1784. Orchard Street United Methodist Church
  1785. Orchestra Hall (Detroit)
  1786. Oregon Caves Chateau
  1787. Oregon Caves Historic District
  1788. Oregon City Bridge
  1789. Oregon City Carnegie Library
  1790. Oregon City Municipal Elevator
  1791. Oregon Commercial Company Building
  1792. Oregon Commercial Historic District
  1793. Oregon Cracker Company Building
  1794. Oregon Creek Covered Bridge
  1795. Oregon Electric Railway Passenger Station
  1796. Oregon Film Museum
  1797. Oregon Hill
  1798. Oregon Historic District
  1799. Oregon Inlet Station
  1800. Oregon Iron Company Furnace
  1801. Oregon Masonic Hall (Oregon, Wisconsin)
  1802. Oregon Mill Complex
  1803. Oregon Pacific Railroad (1880–1894)
  1804. Oregon Portland Cement Building
  1805. Oregon Public Library
  1806. Oregon Railway and Navigation Company Bridge
  1807. Oregon Route 242
  1808. Oregon Shortline Railroad Company Building
  1809. Oregon State Bank Building
  1810. Oregon State Capitol
  1811. Oregon State Fair
  1812. Oregon State Forester's Office Building
  1813. Oregon State Hospital Historic District
  1814. Oregon State Soldier's Home Hospital
  1815. Oregon State University
  1816. Oregon Supreme Court Building
  1817. Oregon Trail (Ada County, Idaho segment)
  1818. Oregon Trail Ruts
  1819. Oregon Trail, Wells Springs Segment
  1820. Oregon Water Tower and Pump House
  1821. Oregon station (Illinois)
  1822. Orem's Delight
  1823. Oren F. and Adelia Parker House
  1824. Orenda/SP-26 Historic District, Chopawamsic RDA Camp 3
  1825. Orendorf Site
  1826. Orford Street Historic District
  1827. Orfordville Depot
  1828. Organ Cave
  1829. Orgonon
  1830. Orie J. Smith Black and White Stock Farm Historic District
  1831. Orient Baptist Church
  1832. Orient Bridge
  1833. Orient Historic District
  1834. Orient Manufacturing Company-Chadwick-Hoskins No. 3
  1835. Orient Point Light
  1836. Oriental Apartments
  1837. Oriental Building Association No. 6 Building
  1838. Oriental Lodge No. 500
  1839. Oriental Mills
  1840. Oriental Textile Mill
  1841. Oriental Theater (Denver)
  1842. Oriental Theatre (Milwaukee)
  1843. Orient–Fosterville Border Crossing
  1844. Original Church of God (Pulaski, Tennessee)
  1845. Original Congregational Church of Wrentham
  1846. Original Highlands, Louisville
  1847. Original Main Street Historic District
  1848. Original Newburgh Historic District
  1849. Original Springs Hotel and Bathhouse
  1850. Original Town of Fernandina Historic Site
  1851. Original Townsite Historic District
  1852. Original Wasco County Courthouse
  1853. Orin Clark House
  1854. Orin Jordan House
  1855. Orin Savage Cottage
  1856. Orion Clemens House
  1857. Oriskany Battlefield State Historic Site
  1858. Orkney Springs Hotel
  1859. Orland P. Bassett House
  1860. Orlando (Andover, Massachusetts)
  1861. Orlando Brice House
  1862. Orlando H. and Emma H. Hardcastle House
  1863. Orlando Health/Amtrak station
  1864. Orlando Humason House
  1865. Orlando Utilities Commission Administration Building
  1866. Orlando W. Warner House
  1867. Orlean Historic District
  1868. Orleans County Courthouse Historic District
  1869. Orleans County Courthouse and Jail Complex
  1870. Orleans Historic District
  1871. Orman-Adams House
  1872. Ormond Fire House
  1873. Ormond Hotel
  1874. Ormond Plantation House
  1875. Ormond Yacht Club
  1876. Ormonde (Cazenovia, New York)
  1877. Ormonde Apartment Building
  1878. Ormsby-Kelly House
  1879. Ormsby-Laughlin Textile Companies Mill
  1880. Ormsby–Rosser House
  1881. Orna Villa
  1882. Orndoff-Cross House
  1883. Orne Covered Bridge
  1884. Orofino Historic District
  1885. Orono Main Street Historic District
  1886. Orono Post Office
  1887. Orosi Branch Library
  1888. Orote Field
  1889. Orote Historical Complex
  1890. Oroville Carnegie Library
  1891. Oroville Chinese Temple
  1892. Orpheum Lofts
  1893. Orpheum Theater (New Orleans)
  1894. Orpheum Theater (Sioux Falls)
  1895. Orpheum Theater (St. Louis)
  1896. Orpheum Theatre (Champaign, Illinois)
  1897. Orpheum Theatre (Madison, Wisconsin)
  1898. Orpheum Theatre (Memphis)
  1899. Orpheum Theatre (Minneapolis)
  1900. Orpheum Theatre (Omaha)
  1901. Orpheum Theatre (Phoenix, Arizona)
  1902. Orpheum Theatre (Sioux City, Iowa)
  1903. Orpheum Theatre (Wichita, Kansas)
  1904. Orr Iron Company
  1905. Orr Roadside Parking Area
  1906. Orr School
  1907. Orr-Herl Mound and Village Site
  1908. Orrin B. Hartley House
  1909. Orrin Hoadley House
  1910. Orrin Todd House
  1911. Orrin W. Burritt House
  1912. Orrin White House
  1913. Orrin and Roxanne Fairman Kinyon House
  1914. Orsel and Minnie McGhee House
  1915. Orson Ames House
  1916. Orson Everitt House
  1917. Orson Grimmett Bungalow
  1918. Orson Pratt House
  1919. Orson Rogers House
  1920. Ortega (Jacksonville)
  1921. Orth C. Galloway House
  1922. Orth House
  1923. Orthodox Meetinghouse
  1924. Ortiz House (Yuma, Arizona)
  1925. Orton Memorial Laboratory
  1926. Orton Park
  1927. Orton Park Historic District
  1928. Orton Plantation
  1929. Ortonville Mill
  1930. Orvall Gammill Barn
  1931. Orville Beach Memorial Manual Training School
  1932. Orville Jackson House
  1933. Orville P. and Sarah Chubb House
  1934. Orville T. Waring House
  1935. Orvis Road Historic District
  1936. Orwell Site (Orwell, Vermont)
  1937. Orwell site (Fergus Falls, Minnesota)
  1938. Osage Bank of Fairfax
  1939. Osage Commercial Historic District
  1940. Osage County Courthouse (Kansas)
  1941. Osage County Poorhouse
  1942. Osage Farms Resettlement Properties in Pettis County, Missouri
  1943. Osage Mills Dam
  1944. Osage Mission Infirmary
  1945. Osage Village State Historic Site
  1946. Osborn Hotel
  1947. Osborn House
  1948. Osborn Street School
  1949. Osborne Homestead Museum
  1950. Osborne House (Victor, New York)
  1951. Osborne Public Carnegie Library
  1952. Osborne Wells House
  1953. Osborn–Bennett Historic District
  1954. Osborn–Bouton–Mead House
  1955. Oscar Anderson House Museum
  1956. Oscar Blomeen House
  1957. Oscar C. Diehl House
  1958. Oscar C. Woods House
  1959. Oscar Carlson House
  1960. Oscar Chambers House
  1961. Oscar Crow House
  1962. Oscar Easley Block
  1963. Oscar F. Lyons House
  1964. Oscar Foss Memorial Library
  1965. Oscar G. Johnson VA Medical Center
  1966. Oscar G. and Mary H. Burch House
  1967. Oscar Gill House
  1968. Oscar Hammerstein II Farm
  1969. Oscar Leibhart Site
  1970. Oscar Lindsay House
  1971. Oscar M. Booth House
  1972. Oscar Nichols House
  1973. Oscar Redman Building
  1974. Oscar Roeser House
  1975. Oscar Stanton De Priest House
  1976. Oscar Taylor House
  1977. Oscar W. Underwood House
  1978. Oscar and Christina Beckman Farmstead
  1979. Oscar-Zero Missile Alert Facility
  1980. Osceola Apartment Hotel
  1981. Osceola Commercial Historic District
  1982. Osceola County Courthouse (Florida)
  1983. Osceola County Courthouse (Iowa)
  1984. Osceola Ditch
  1985. Osceola Park Historic Residential District
  1986. Osceola Public School Building
  1987. Osceola Times Building
  1988. Osceola Town Hall
  1989. Osceola station
  1990. Osceola station (Wisconsin)
  1991. Osgood Bradley Building
  1992. Osgood Building
  1993. Osgood Ditch
  1994. Osgood Family House
  1995. Osgood Farm
  1996. Osgood Gamekeeper's Lodge
  1997. Osgood Hill
  1998. Osgood–Kuhnhausen House
  1999. Oshkosh Grand Opera House
  2000. Oshkosh Northwestern
  2001. Oshkosh Water Tower
  2002. Oshtemo Town Hall
  2003. Oskaloosa City Hall
  2004. Oskaloosa City Park and Band Stand
  2005. Oskaloosa City Square Commercial Historic District
  2006. Oskaloosa Fire Station
  2007. Oskaloosa Monthly Meeting of Friends Parsonage
  2008. Oskaloosa Post Office
  2009. Oskaloosa Public Library
  2010. Oskaloosa station
  2011. Oskar G. Stonorov House
  2012. Osmund Osmundson House
  2013. Osmyn and Emily Deuel House
  2014. Osprey School
  2015. Osprey Site
  2016. Ossabaw Island
  2017. Osseo Water Tower
  2018. Ossian H. Sweet House
  2019. Ossian Opera House
  2020. Ossian Wilbur Goss Reading Room
  2021. Ossoli Circle
  2022. Ost Valle Bridge
  2023. Osterburg Covered Bridge
  2024. Osterhoudt Stone House
  2025. Osterman and Tremaine Building
  2026. Osterville Baptist Church
  2027. Oswald J. Nitschke House
  2028. Oswegatchie Historic District
  2029. Oswegatchie Pumping Station
  2030. Oswego Armory
  2031. Oswego City Hall
  2032. Oswego City Library
  2033. Oswego County Courthouse
  2034. Oswego Harbor West Pierhead Light
  2035. Oswego Meeting House and Friends' Cemetery
  2036. Oswego Public Library
  2037. Oswego Theater
  2038. Oswego United States Post Office
  2039. Oswego Yacht Club
  2040. Oswego–Oneida Streets Historic District
  2041. Oteen Veterans Administration Hospital Historic District
  2042. Otero's 66 Service
  2043. Otha Walker Homestead
  2044. Other C. Wamsley House
  2045. Othniel Looker House
  2046. Otho Poole House
  2047. Otis Angell Gristmill
  2048. Otis Cary House
  2049. Otis Center Historic District
  2050. Otis Company Mill No. 1
  2051. Otis Elevator Company Building (Portland, Oregon)
  2052. Otis Elevator Company Factory Building
  2053. Otis Hare Archeological Site
  2054. Otis Hotel
  2055. Otis L. Brown House
  2056. Otis Park and Golf Course
  2057. Otis Putnam House
  2058. Otis Starkey House
  2059. Otis Theodore and Effiegene Locke Wingo House
  2060. Otis-Wyman House
  2061. Otoe County Courthouse
  2062. Otowi Historic District
  2063. Otowi Suspension Bridge
  2064. Otranto Plantation
  2065. Otranto Plantation Indigo Vats
  2066. Otsdawa Baptist Church
  2067. Otsego Apartments
  2068. Otsego County Courthouse
  2069. Ott's Assay Office
  2070. Ott's Chapel
  2071. Ottari Sanitarium
  2072. Ottauquechee River Bridge
  2073. Ottawa (tug)
  2074. Ottawa Beach Historic District
  2075. Ottawa Commercial Historic District
  2076. Ottawa East Side Historic District
  2077. Ottawa High School and Junior High School
  2078. Ottawa Library (Kansas)
  2079. Ottawa Street Power Station
  2080. Ottawa Waterworks Building
  2081. Ottendorfer Public Library and Stuyvesant Polyclinic Hospital
  2082. Otter Creek Archaeological Site (Ferrum, Virginia)
  2083. Otter Creek Bridge (Cedar Vale, Kansas)
  2084. Otter Creek Bridge (Oelwein, Iowa)
  2085. Otter Lake Community Church
  2086. Otter Spring House
  2087. Otter Tail County Courthouse
  2088. Otterbein Church (Baltimore, Maryland)
  2089. Otterbein Church (Evans, West Virginia)
  2090. Otterburn (Bedford, Virginia)
  2091. Otto Brinkmann House
  2092. Otto Carmichael House
  2093. Otto H. Baring House
  2094. Otto Huechling House
  2095. Otto J. Hager House
  2096. Otto Schlemmer Building
  2097. Otto Sr. and Lisette Hahn House
  2098. Otto W. and Ida L. Nelson House
  2099. Otto and Hilda Gretzinger House
  2100. Otto and Verdell Rutherford House
  2101. Ottumwa Cemetery
  2102. Ottumwa City Hall
  2103. Ottumwa Public Library
  2104. Ottumwa Regional Airport
  2105. Ottumwa Young Women's Christian Association
  2106. Ottumwa station
  2107. Otway Covered Bridge
  2108. Otway Henderson House
  2109. Otwell (Oxford, Maryland)
  2110. Ouachita Avenue Historic District
  2111. Ouachita County Courthouse
  2112. Ouachita Parish High School
  2113. Ouachita River Bridge (Arkadelphia, Arkansas)
  2114. Ouachita River Lock and Dam No. 8
  2115. Ouaquaga Lenticular Truss Bridge
  2116. Ouilmette North Historic District
  2117. Oulagisket
  2118. Our Lady Help of Christians Chapel (Cheektowaga, New York)
  2119. Our Lady Help of Christians Historic District (Newton, Massachusetts)
  2120. Our Lady of Good Voyage Church (Gloucester, Massachusetts)
  2121. Our Lady of Grace Church (Reserve, Louisiana)
  2122. Our Lady of Guadaloupe Church
  2123. Our Lady of Guadalupe Church (San Jose, California)
  2124. Our Lady of Guadalupe Church and Medina Cemetery
  2125. Our Lady of Limerick Catholic Church (Glenns Ferry, Idaho)
  2126. Our Lady of Loretto Roman Catholic Church and Cemetery
  2127. Our Lady of Lourdes Church (Victoria, Texas)
  2128. Our Lady of Lourdes Church Complex
  2129. Our Lady of Mercy Chapel
  2130. Our Lady of Mercy High School (Ohio)
  2131. Our Lady of Mount Carmel Grotto
  2132. Our Lady of Mt. Carmel Church
  2133. Our Lady of Perpetual Help Church (Altus, Arkansas)
  2134. Our Lady of Perpetual Help Roman Catholic Church
  2135. Our Lady of Purification Catholic Church
  2136. Our Lady of Sorrows Catholic Church (Rock Springs, Wyoming)
  2137. Our Lady of Sorrows Chapel
  2138. Our Lady of Sorrows Church (Bernalillo, New Mexico)
  2139. Our Lady of Sorrows Church (Las Vegas, New Mexico)
  2140. Our Lady of Victory Academy (Fort Worth, Texas)
  2141. Our Lady of Victory Catholic Church (Pearce, Arizona)
  2142. Our Lady of Victory Roman Catholic Church
  2143. Our Lady of the Angels Academy
  2144. Our Lady of the Angels School (Albuquerque, New Mexico)
  2145. Our Lady of the Annunciation Chapel at Annunciation Priory
  2146. Our Lady of the Assumption School
  2147. Our Lady of the Blessed Sacrament Church
  2148. Our Lady of the Ozarks Shrine
  2149. Our Lady of the Rosary Church (Detroit)
  2150. Our Lady of the Wayside Church
  2151. Our Lady, Queen of Heaven Church
  2152. Our Mother of Mercy Catholic Church and Parsonage
  2153. Our Mother of Sorrows Grotto Historic District
  2154. Our Mother of Sorrows Monastery and Retreat Center (West Springfield, Massachusetts)
  2155. Our Mother of Sorrows Roman Catholic Church Complex
  2156. Our Savior's Kvindherred Lutheran Church (Calamus, Iowa)
  2157. Our Savior's Lutheran Church (Menno, South Dakota)
  2158. Our Savior's Scandinavian Lutheran Church
  2159. Our Saviour's Evangelical Lutheran Church
  2160. Ourant's School
  2161. Ouray City Hall and Walsh Library
  2162. Ouray Historic District
  2163. Out-of-Door Academy
  2164. Outdoor Art Club
  2165. Outing Club
  2166. Outing Park Historic District
  2167. Outlands in the Eighty Acres
  2168. Outlaw Inn
  2169. Outlet Mound
  2170. Outlook station (Montana)
  2171. Over-the-Jumps Carousel
  2172. Over-the-Rhine
  2173. Overackers Corners Schoolhouse
  2174. Overbrook (Nashville, Tennessee)
  2175. Overbrook Elementary School
  2176. Overbrook Farms, Philadelphia
  2177. Overbrook High School (Philadelphia)
  2178. Overcarsh House
  2179. Overfield Tavern
  2180. Overholser Mansion
  2181. Overland Waterloo Company Building
  2182. Overlook (Little Falls, New York)
  2183. Overlook (Martinsburg, West Virginia)
  2184. Overlook Castle
  2185. Overlook Historic District
  2186. Overmyer–Waggoner–Roush Farm
  2187. Overseas Highway
  2188. Overstreet Hall
  2189. Overstreet House
  2190. Overton Corners–Lacolle 221 Border Crossing
  2191. Overton Farm
  2192. Overton Gymnasium
  2193. Overton Lane
  2194. Overton Park
  2195. Overtown Historic District
  2196. Oviatt House
  2197. Owasco Reformed Church
  2198. Owatonna Commercial Historic District
  2199. Owatonna Firemen's Hall
  2200. Owatonna Public Library
  2201. Owego Central Historic District
  2202. Owen A. and Emma J. Garretson House
  2203. Owen B. Pickett United States Custom House
  2204. Owen Building (Columbia, South Carolina)
  2205. Owen Chapel Church of Christ
  2206. Owen Coachman House
  2207. Owen County Courthouse (Indiana)
  2208. Owen County Courthouse and Jail
  2209. Owen E. LeFevre House
  2210. Owen Estate
  2211. Owen Family House and Cemetery
  2212. Owen High School
  2213. Owen Lovejoy House
  2214. Owen Martin House
  2215. Owen Moon Farm
  2216. Owen Park, Tulsa
  2217. Owen Plantation House
  2218. Owen Tudor Hedges House
  2219. Owen-Cox House
  2220. Owen-Gay Farm
  2221. Owen-Harrison House
  2222. Owen-Primm House
  2223. Owensville Historic District
  2224. Owens–Thomas House
  2225. Owings House
  2226. Owings Upper Mill
  2227. Owingsville Commercial District and Courthouse Square
  2228. Owl Blacksmith Shop
  2229. Owl's Bend Site
  2230. Owl's Head Historic District
  2231. Owl's Nest
  2232. Owl's Nest Country Place
  2233. Owls Head (Hebron, New Hampshire)
  2234. Owls Head Light
  2235. Owosso Downtown Historic District
  2236. Owsley Bridge
  2237. Owyhee County Courthouse
  2238. Owyhee Dam
  2239. Ox Bow Inn
  2240. Oxbow Archeological District
  2241. Oxbow Historic District
  2242. Oxford Commercial Historic District
  2243. Oxford Congregational Church and Cemetery
  2244. Oxford Courthouse Square Historic District
  2245. Oxford Downtown Historic District
  2246. Oxford Female Institute
  2247. Oxford Furnace
  2248. Oxford Historic District (Georgetown, Kentucky)
  2249. Oxford Historic District (Oxford, Georgia)
  2250. Oxford Historic District (Oxford, Maryland)
  2251. Oxford Historic District (Oxford, North Carolina)
  2252. Oxford Historic District (Oxford, Pennsylvania)
  2253. Oxford Hotel (Denver, Colorado)
  2254. Oxford Hotel (Oxford, Pennsylvania)
  2255. Oxford Hotel (West Baden Springs, Indiana)
  2256. Oxford House (Grand Forks, North Dakota)
  2257. Oxford Industrial Historic District
  2258. Oxford Main Street Historic District
  2259. Oxford Presbyterian Church
  2260. Oxford School (Fairhaven, Massachusetts)
  2261. Oxford Village Historic District
  2262. Oxford station (Baltimore and Ohio Railroad)
  2263. Oxford-Whitney Streets Historic District
  2264. Oxford–Crown Historic District
  2265. Oxley Barn
  2266. Oxmoor Farm
  2267. Oxnard Historic Farm Park
  2268. Oxon Cove Park and Oxon Hill Farm
  2269. Oxon Hill Manor
  2270. Oyster Bay station
  2271. Ozark Courthouse Square Historic District (Ozark, Arkansas)
  2272. Ozark Courthouse Square Historic District (Ozark, Missouri)
  2273. Ozark Iron Furnace Stack
  2274. Ozark Trails Marker at Lake Arthur
  2275. Ozark station (Arkansas)
  2276. Ozette Indian Village Archeological Site
  2277. Ozias Goodwin House
  2278. Ozmer House
  2279. Ozone School
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