User:NE2/Interstate history

1955 maps and later (ignoring the 1957 numbering; all two-digit numbers given are 1958, and three-digit numbers are not necessarily the original ones)

AASHTO approvals were often several years late.

Interstate 2

• 2013 AASHTO/TXDOT (2)

Interstate 4

• 1955 (4); 1969 AASHO west of Tampa became 75

Interstate 5

• 1955 (5, 5E; all 5 by 1964)
• Interstate 105 (California): 1955 (105); 1965? FHWA/1970 AASHO deleted
• Interstate 105 (California): 1968 FHWA (part http://www.fhwa.dot.gov/highwayhistory/data/page05.cfm trade-in for other routes], part Howard-Cramer)/1970 AASHO (105)
• Interstate 105 (Oregon): 1955 (105)
• Interstate 205 (California): 1957 FHWA (205)
• Interstate 205 (Oregon-Washington): 1955 (205)
• Interstate 305 (California): 1955 (80); 1980 FHWA/AASHTO (305)
• Interstate 305 (Oregon): 1955 (305); 1977 FHWA deleted
• Interstate 405 (California): 1955 (405)
• Interstate 405 (Oregon): 1955 (405)
• Interstate 405 (Washington): 1955 (405)
• Interstate 505 (California): 1955 (5W); 1964 FHWA (505)
• Interstate 505 (Oregon): 1968 FHWA/1969 AASHO (505); 1979 FHWA deleted
• Interstate 605 (California): 1955 south of I-10 (605); 1968 FHWA/1969 AASHO north of I-10 (605)
• Interstate 705 (Washington): 1978 legislated/AASHTO (705)
• Interstate 805 (California): 1957/1958 FHWA (805)
• Interstate 905 (California): 1984 FHWA/AASHTO (905)

Interstate 8

• 1955 (8) - west of I-5 was never officially added

Interstate 10

• 1955 (10); when moved in Phoenix?
• Interstate 110 (California): 1955 (110); 1965? FHWA/1970 AASHO deleted
• Interstate 110 (California): 1978 legislated/1978 FHWA/1979 AASHTO (110)
• Interstate 110 (Florida): 1955 (110)
• Interstate 110 (Louisiana): 1970 AASHO (110)
• Interstate 110 (Mississippi): when? (110)
• Interstate 110 (Texas): 1967 FHWA/1967 TXDOT/1970 AASHO (110)
• Interstate 210 (California): 1955 west of Pomona (210); 1998 AASHTO east of Pomona (210, deferred)
• Interstate 210 (Louisiana): 1955 (210)
• Interstate 310 (Louisiana): 1964 FHWA (trade-in for I-420) (310); 1969 AASHO deleted
• Interstate 310 (Louisiana): 1977 AASHTO (310)
• Interstate 410 (Arizona): 1968 FHWA/1969 AASHO (410); 1969 FHWA (10)
• Interstate 410 (Louisiana): 1955 (410); 1970 AASHO deleted
• Interstate 410 (Louisiana): 1968 FHWA/1969 AASHO (410); 1977 FHWA/AASHTO deleted
• Interstate 410 (Texas): 1955 except north quarter (410); 1969 FHWA/1969 TXDOT/1970 AASHO north quarter (410)
• Interstate 510 (Arizona): 1955 (510); deleted when? later revived as part of I-410
• Interstate 510 (Louisiana): 1977 AASHTO (510)
• Interstate 610 (Louisiana): 1955 (610)
• Interstate 610 (Texas): 1955 except east quarter (610); 1962 TXDOT/1970 AASHO east quarter (610)
• Interstate 710 (Arizona): 1955 (710); 1977 FHWA deleted
• Interstate 710 (California): 1983 FHWA/1984 AASHTO I-10 to SR 1 (710); 1984 FHWA/AASHTO SR 1 to Ocean Boulevard (710) - not an Interstate north of I-10
• Interstate 910 (Louisiana): 1999 FHWA (per 1999 AASHTO) (910)

Interstate 11

• 2014 AASHTO (11)

Interstate 12

• 1957 FHWA (12)

Interstate 15

• 1955 north of I-10 (15); 1968 FHWA/1969 AASHO north of I-8 (15); 1972 FHWA moved around San Bernardino; 1984 FHWA/AASHTO south of I-8 (15)
• Interstate 115 (Montana): 1955 (115)
• Interstate 215 (California): 1972/1973/1997 FHWA (215, renumbered 15E in 1973); 1982 FHWA/AASHTO (215)
• Interstate 215 (Nevada): 1993 FHWA future/AASHTO (215) - note that AASHTO only approved east of SR 593; 2006 FHWA
• Interstate 215 (Utah): 1957 FHWA (215, 415); 1968 UDOT (all 215)
• Interstate 315 (Montana): 1955 (315)
• Interstate 515 (Nevada): 1976 AASHTO partial (515); 1984 AASHTO/1994 FHWA extended (515)

Interstate 16

• 1955 (16)
• Interstate 516 (Georgia): 1984 FHWA/AASHTO (516)

Interstate 17

• 1955 (10, 17); when? (all 17)

Interstate 19

• 1955 (19)

Interstate 20

• 1955 (20); 1964 TXDOT moved south between I-35W and I-35E but not elsewhere; 1971 TXDOT moved south around Dallas-Fort Worth; 1984 FHWA cutoff west of Fort Worth (20) - but this was in TXDOT 1971
• Interstate 220 (Louisiana): 1955 (220)
• Interstate 220 (Mississippi): 1955 (220)
• Interstate 420 (Georgia): 1975 AASHTO (420); 1983 FHWA deleted
• Interstate 420 (Louisiana): 1955 (420); 1964 FHWA/1970 AASHO deleted
• Interstate 520 (Georgia-South Carolina): 1977 AASHTO (part trade-in for I-485, part Howard-Cramer) west of New Savannah Road (520); 2011 AASHTO in SC (520) - what about the rest in Georgia?
• Interstate 820 (Texas): 1955 except northwest quarter (820); 1968 FHWA/1968 TXDOT/1969 AASHO northwest quarter (820); 1971 TXDOT part became I-20

Interstate 22

• 2012 AASHTO in Alabama (22); when? in Mississippi (22)
• Interstate 222 (Alabama): 2012 AASHTO (222)
• Interstate 422 (Alabama): 2012 AASHTO (422)

Interstate 24

• 1955 east of Nashville (24)
• 1957 FHWA west of Nashville (24)
• Interstate 124 (Tennessee): 1955 (124)

Interstate 25

• 1955 (25)
• Interstate 225 (Colorado): 1955 (225)

Interstate 26

• 1955 east of Asheville (26)
• 1985 FHWA/1986 AASHTO Johnson City to Kingsport (181); 2003 AASHTO I-81 to Kingsport (26, denied); 2005 legislated I-81 to Kingsport (26)
• 1988 AASHTO Asheville to I-81 (26)
• Interstate 126 (South Carolina): 1955 (126) - plans were very different in 1955
• Interstate 526 (South Carolina): 1978 AASHTO/1992 FHWA east of I-26 (526) - FHWA is east of Wando River; 1989 AASHTO/1990 FHWA east of SC 7 (526) - but FHWA and 1992 AASHTO says this was all the way to US 17!

Interstate 27

• 1968 FHWA/1968 TXDOT/1969 AASHO north of Loop 289 (27); 1975 TXDOT inside Loop 289 (was this already approved by FHWA in 1968?)

Interstate 29

• 1955 south of Sioux Falls and north of Fargo (29)
• 1957 FHWA Sioux Falls to Fargo (29)
• Interstate 129 (Iowa-Nebraska): 1968 FHWA/1969 AASHO (129)
• Interstate 229 (Missouri): 1955 (229)
• Interstate 229 (South Dakota): 1955 (229)

Interstate 30

• 1955 (30); 1971 FHWA/TXDOT extended west replacing I-20, with Dallas-Fort Worth Turnpike readded
• Interstate 430 (Arkansas): 1955 (430)
• Interstate 530 (Arkansas): 1983-11 FHWA (per AHTD minutes 1985-10 473); 1997 AASHTO (530)
• Interstate 630 (Arkansas): by 1971 (630)

Interstate 35

• 1955 except north of I-535 (35), 1957 FHWA all the way? to 68th Avenue in Duluth (35); 1981 FHWA deleted 26th Avenue to 68th Avenue in Duluth
• Interstate 35E (Minnesota): 1955 (35E)
• Interstate 35E (Texas): 1955 (35E)
• Interstate 35W (Minnesota): 1955 (35W)
• Interstate 35W (Texas): 1955 (35W)
• Interstate 135 (Kansas): 1955 (35W); 1976 AASHTO (135)
• Interstate 235 (Iowa): 1955 (235)
• Interstate 235 (Kansas): 1955 (235)
• Interstate 235 (Oklahoma): 1976 FHWA/AASHTO (235)
• Interstate 335 (Kansas): 1987 FHWA/AASHTO (335)
• Interstate 335 (Minnesota): when? (335); 1978 FHWA deleted
• Interstate 435 (Kansas-Missouri): 1955 east of I-35 (435); 1968 FHWA/1969 AASHO west of I-35 (435)
• Interstate 535 (Minnesota-Wisconsin): 1955? (535)
• Interstate 635 (Kansas-Missouri): 1955 (635)
• Interstate 635 (Texas): 1955 east half (635); 1971 TXDOT part became I-20; 1974 AASHTO/TXDOT west of I-35E (635)

Interstate 37

• 1957 FHWA (missing from the list) (37)

Interstate 39

• 1984 AASHTO/1985 FHWA I-80 to I-90 (39, denied but apparently added anyway)
• 1986 AASHTO/1992 FHWA I-55 to I-80 (39)
• 1993 AASHTO/1996 FHWA I-90 to Wausau (39)

Interstate 40

• 1955 west of Greensboro (40); 1981 FHWA/1982 AASHTO replaced I-240 in Memphis; 1992 AASHTO moved around Winston-Salem; when? moved around Greensboro and then back
• 1968 FHWA/1969 AASHO west of Smithfield - later realigned to Benson (40)
• 1984 AASHTO/2009? FHWA Wilmington to Wallace/Watha (40)
• 1990 AASHTO/2009? FHWA Benson to Wallace/Watha (40)
• Interstate 140 (North Carolina): 2002 FHWA (per Kurumi)/2003 AASHTO US 17 to US 17 (140)
• Interstate 140 (Tennessee): 1992 AASHTO/1997 FHWA (140)
• Interstate 240 (North Carolina): 1976 FHWA/AASHTO (240) - FHWA is partial
• Interstate 240 (Oklahoma): 1957 FHWA southeast quarter (240); 1968 FHWA/1969 AASHO southwest quarter (240 - 440 until 1974 per FHWA, but always 240 in AASHO)
• Interstate 240 (Tennessee): 1955 (240, 255) - note that the southwest quarter was I-55 in 1955, and I-40 cut through the center; 1973 AASHTO (all 240); 1982 AASHTO north half became I-40
• Interstate 440 (Arkansas): 1980 FHWA
• Interstate 440 (North Carolina): 1991 FHWA/AASHTO (440); 2008 AASHTO deleted I-40 overlap
• Interstate 440 (Tennessee): 1955 (440)
• Interstate 540 (Arkansas): 1955 Hwy. 22 to I-40 (540); 1978 FHWA/AASHTO Hwy. 22 to Oklahoma (540)
• Interstate 540 (North Carolina): 1996 AASHTO NC 55 to US 64 (540); 1997 FHWA I-40 to US 70 only (540); when? US 70 to US 64 (540)
• Interstate 640 (Tennessee): 1955 (640)
• Interstate 840 (North Carolina): 2010 AASHTO (840)

Interstate 41

• 2012 AASHTO (41)

Interstate 43

• 1968 FHWA/1969 AASHO north of Milwaukee (57); 1974 AASHTO (43)
• 1987 FHWA/AASHTO south of Milwaukee (43)

Interstate 44

• 1955 east of I-40 (44, 440); 1975 AASHTO (44, 240); 2003 AASHTO realigned east of Tulsa (44); 2013 AASHTO extended in St. Louis (44)
• 1982 FHWA/AASHTO/TXDOT west of I-240 (all 44; 240 overlap eliminated 1982 FHWA/AASHO other meeting) - FHWA is 1984 in Texas
• Interstate 244 (Oklahoma): 1955 (244)
• Interstate 444 (Oklahoma): when? (444)

Interstate 45

• 1955 (45)
• Interstate 345 (Texas): 1964 FHWA/1964 TXDOT/1970 AASHO (345)

Interstate 49

• 1977 AASHTO (part trade-in for I-410, part Howard-Cramer) Opelousas to I-20 (49)
• 1981 FHWA/AASHTO I-10 to Opelousas (49)
• 1983 FHWA I-40 to north end of Fayetteville bypass (per AHTD minutes 1984-11 527)
• 1997 AASHTO I-40 to Fayetteville (49, denied); 1997 AASHTO (540); 2013 AASHTO (49)
• legislated/1998 AASHTO north of I-310 (49)
• legislated/1999 AASHTO I-10 to I-310 (49)
• 2000 AASHTO Fayetteville to Rogers (540); 2013 AASHTO (49)
• legislated/2000 AASHTO US 71 to I-30 (130); 2013 AASHTO (49)
• 2007 AASHTO Louisiana to US 71 north of Texarkana and I-40 to I-44 (49, denied); 2011 AASHTO Arkansas to I-435 (49); 2013 AASHTO Louisiana to Missouri (49)
• 2008 AASHTO I-20 to Arkansas (49, denied); 2014 AASHTO I-220 to Arkansas (49)

Interstate 55

• 1955 (55)
• Interstate 155 (Illinois): 1974 AASHTO Lincoln to I-180 (future); 1990 AASHTO/1995 FHWA Lincoln to I-74 (37, deferred; approved 1991 as 155)
• Interstate 155 (Missouri-Tennessee): 1964 FHWA (155)
• Interstate 255 (Illinois-Missouri): 1955 south of I-70 (255); when? north of I-70 (255); 1974 AASHTO (270), obviously not carried through; 1979 AASHTO (back to 255)
• Interstate 355 (Illinois): 1988 AASHTO/1990 FHWA north of I-55 (355); 2008 FHWA/AASHTO south of I-55 (355)
• Interstate 555 (Arkansas): 1999 AASHTO (555, denied; approved 2000)

Interstate 57

• 1955 (57)

Interstate 59

• 1955 (59)
• Interstate 359 (Alabama): 1955 (359)
• Interstate 459 (Alabama): 1955 (459) - note that there was also a northern bypass east of I-65, with unknown number)
• Interstate 759 (Alabama): 1955 (759)

Interstate 64

• 1955 east of St. Louis (64)
• 1987 FHWA/AASHTO remainder (64)
• Interstate 164 (Indiana): 1968 FHWA/1969 AASHO (164); 1979 legislated extension (164); 2013 AASHTO mostly renumbered (69)
• Interstate 264 (Kentucky): 1955 east of I-65 (264), 1957 FHWA? west of I-65 (264) - why both an 'urban connection' and a beltway?
• Interstate 264 (Virginia): 1955 west of I-64 (264); 1997 AASHTO east of I-64 (264)
• Interstate 464 (Virginia): 1955 (464)
• Interstate 564 (Virginia): 1955 (564)
• Interstate 664 (Virginia): 1968 FHWA partial (64); 1971-92 FHWA/1992 AASHTO complete (664)

Interstate 65

• 1955 south of I-80 (65); soon north of I-80; 2000 AASHTO replaced I-265 in Nashville
• Interstate 165 (Alabama): 1980 FHWA (per Kurumi)/1981 AASHTO (210); 1987 FHWA (per Kurumi)/1989 AASHTO south end truncated (165)
• Interstate 165 (Indiana): 1978 FHWA (165); 1981 FHWA deleted
• Interstate 265 (Indiana): 1957 FHWA?? (265)
• Interstate 265 (Kentucky): 1978 AASHTO/1987 FHWA/1987 KYTC south of I-71 (265)
• Interstate 265 (Tennessee): 1955 (265); 2000 AASHTO (65)
• Interstate 465 (Indiana): 1955 except I-865 south to I-65 (465); 1970 FHWA/AASHO remainder (465)
• Interstate 565 (Alabama): 1968 FHWA/1969 AASHO (565); when? extended - or was it?
• Interstate 865 (Indiana): 1955 (465); 2002 AASHTO (865)

Interstate 66

• 1955 (66); 1977-83 FHWA deleted unbuilt end
• Interstate 266 (District of Columbia-Virginia): 1957 FHWA? (266); 1977-78-82-83 FHWA deleted

Interstate 68

• 1989 AASHTO/1991 FHWA (68)

Interstate 69

• 1955 Indianapolis to Marshall (69) - note that north of I-90 was farther west in 1957; 1968 FHWA/1969 AASHO Marshall to I-75 (69); 1973 FHWA/AASHTO I-75 to I-475 (69); when? deleted inside I-465 (later became I-165 south of 38th Street); 1983 AASHTO/1987 FHWA north of Flint (69)
• legislated/2007 AASHTO I-55 to MS 304 (69)
• legislated/2008 AASHTO along I-55/I-240/I-40 to SR 300 (69)
• legislated/2010 AASHTO I-64 to US 231 (69)
• legislated/2011 AASHTO Gilbertsville to Nortonville (69)

and more in Texas...

• legislated/2012 AASHTO US 231 to SR 37 (69)
• legislated/2013 AASHTO most of I-164 (69)
• Interstate 69E: legislated/2011 AASHTO Robstown to I-37 (69)
• Interstate 369 (Texas): 2012 AASHTO/2013 TXDOT I-30 to Loop 151 (369)
• Interstate 469 (Indiana): 1989 AASHTO/1995 FHWA (469)

Interstate 70

• 1955 east of Denver (70, 70N, 70S); 1964 FHWA (70, 70N); 1975 FHWA (all 70); 1981 FHWA deleted from MD 122 to I-170; 2013 AASHTO moved in St. Louis; 2014 AASHTO deleted inside I-695
• 1957 FHWA west of Denver (70)
• Interstate 170 (Maryland): 1955 (70N); 1970 AASHO (170); 1982 AASHTO including part of I-70 (595); 1983 FHWA deleted
• Interstate 170 (Missouri): 1978 AASHTO north of I-70 (170); 1979 AASHTO/1986 FHWA south of I-70 (170) - FHWA is only south of Route D
• Interstate 270 (Colorado): 1955 east of I-76 (270); 2000 AASHTO west of I-76 (270)
• Interstate 270 (Illinois-Missouri): 1955 (270, 244) - note that I-44 and I-244 ran together to I-55 in 1955, probably the reason I-244 was numbered such - was this changed in 1957 FHWA, or was something else added?; 1974 AASHTO (all 270, including 255!)
• Interstate 270 (Maryland): 1955 (70S); 1975 FHWA/AASHTO deleted inside I-495 (70S); 1975 FHWA (270)
• Interstate 270 Spur (Maryland): 1957 FHWA?? (270); 1975 FHWA (270 Spur)
• Interstate 270 (Ohio): 1955 (270)
• Interstate 370 (Maryland): 1975 AASHTO (part trade-in for other routes, part Howard-Cramer) (370); 2012 AASHTO east end modified
• Interstate 470 (Colorado): 1968 FHWA/1969 AASHO southwest quarter (225, renumbered 470 in 1969 before AASHO); 1977 FHWA deleted
• Interstate 470 (Kansas): 1955 (470)
• Interstate 470 (Missouri): 1955 (470)
• Interstate 470 (Ohio-West Virginia): 1955 (470)
• Interstate 670 (Kansas-Missouri): 1957 FHWA? east of I-35 (35 south leg); 1970 AASHO remainder (670); 1975 AASHTO (all 670, deferred and approved 1976)
• Interstate 670 (Ohio): when? west of I-71 (70N); 1975 FHWA (per 2004 AASHTO)/1973 AASHTO west of I-71 (670); 1975 FHWA (per 2004 AASHTO)/1981 AASHTO east of I-71 (670)

Interstate 71

• 1955 (71)
• Interstate 271 (Ohio): 1955 north of I-480 (271) - original plan was to turn west on I-480 to I-71; by 1962 south of I-480 (271)
• Interstate 471 (Kentucky-Ohio): 1955 (471) - note it was to return to I-71 in Kentucky

Interstate 72

• 1968 FHWA/1969 AASHO east of Springfield (72)
• 1987 AASHTO Springfield to I-172 (72, denied); 1991 AASHTO Springfield to I-172 (172); 1995 FHWA/AASHTO Springfield to Hannibal (72) - FHWA is only east of I-172
• Interstate 172 (Illinois): 1987 AASHTO (72, denied); 1995 FHWA/AASHTO (172)

Interstate 73

• 1995 legislated per 1996 AASHTO (NC submitted); 1996 AASHTO Roanoke to Charleston

Interstate 74

• 1955 west of Cincinnati (74)
• 1995 legislated per 1996 AASHTO east of Cincinnati (NC submitted); 1996 AASHTO Wytheville to Myrtle Beach
• Interstate 474 (Illinois): 1955 (474)

Interstate 75

• 1955 north of Tampa (75); 1968 FHWA/1969 AASHO south of Tampa (75); 1969-70 FHWA (Howard-Cramer) moved around Tampa; 1980 AASHTO moved onto I-640
• Interstate 175 (Florida): 1982 FHWA/AASHTO (175)
• Interstate 175 (Georgia): 1975 AASHTO (175); when? deleted
• Interstate 275 (Florida): 1955 north of St. Petersburg (4, 75); 1969 AASHO south of St. Petersburg (75); FHWA 1969-70 (275) - was it originally 75E, or was that unofficial?
• Interstate 275 (Indiana-Kentucky-Ohio): 1955 from I-74 to I-75 north (275), 1957 FHWA remainder? (275)
• Interstate 275 (Michigan): 1955 (275); when? deleted north half
• Interstate 275 (Tennessee): 1955 (75); 1980 AASHTO (275)
• Interstate 375 (Florida): 1982 FHWA/AASHTO (375)
• Interstate 375 (Michigan): 1955? (375) - somewhat different network in 1955
• Interstate 475 (Georgia): 1955 (475)
• Interstate 475 (Michigan): 1955 (475)
• Interstate 475 (Ohio): 1955 south half (475); by 1957? (by which time I-80 was on the Ohio Turnpike) north half (475)
• Interstate 575 (Georgia): 1977 AASHTO (part trade-in for I-485, part Howard-Cramer) (575)
• Interstate 675 (Georgia): 1975 AASHTO (part trade-in for I-485, part Howard-Cramer) (675)
• Interstate 675 (Michigan): 1955 (675)
• Interstate 675 (Ohio): 1957 FHWA returning to I-75 in the north (675); 1968 FHWA/1969 AASHO rerouted to I-70 (675)

Interstate 76 (west)

• 1955 east of I-25 (80S); 1968 FHWA/1969 AASHO west of I-25 (80S); 1974 FHWA/AASHTO (76) - Colorado wanted to continue I-76 west to Grand Junction!?

Interstate 76 (east)

• 1955 (80, 80S; all 80S by 1964); 1964 FHWA (76, 80S); 1971 AASHO/1972 FHWA (all 76); 1972 FHWA/AASHO swapped with 676
• Interstate 176 (Pennsylvania): 1955 (180); 1964 FHWA (176)
• Interstate 276 (Pennsylvania): 1955 (280); 1964 FHWA (276)
• Interstate 376 (Pennsylvania): 1955 east of I-79 (70); 1964 FHWA (76, 79); 1970 FHWA/AASHO (all 76); 1971 AASHO/1972 FHWA (279, 376); 2005 legislated/2006 AASHTO (all 376); when? west of I-79 (376)
• Interstate 476 (Pennsylvania): 1955 south of I-76 (480); 1964 FHWA (476); 1977 AASHTO south of I-276 (deferred, approved 1978); 1991 AASHTO south of I-76 (476) - already part of I-476!; 1995 AASHTO/1996 FHWA north of I-76 (476)
• Interstate 676 (New Jersey-Pennsylvania): 1955 (680); 1964 FHWA (676); 1972 FHWA/AASHO swapped with 76

Interstate 77

• 1955 north of Canton (77, 177; all 77 in 1958)
• 1957 FHWA north of Charlotte (77)
• 1968 FHWA/1969 AASHO north of I-20 (77)
• 1976 AASHTO south of SC 48 (326); 1995 FHWA/AASHTO south of I-20 (77)
• Interstate 277 (North Carolina): 1978 FHWA/AASHTO (277) - FHWA is partial
• Interstate 277 (Ohio): 1957 FHWA (277)

Interstate 78

• 1955 (78); 1969 AASHO deleted east of I-278
• Interstate 178 (Pennsylvania): 1955 (178); 1970 AASHO deleted
• Interstate 278 (New Jersey-New York): 1955 (278, 878); 1968 AASHO deleted west of US 1; 1969 AASHO (all 278)
• Interstate 378 (Pennsylvania): 1955 (178); 1970 AASHO deleted
• Interstate 478 (New York): 1955 (478); 1971 FHWA moved to West Side Highway; 1985 FHWA/1986 AASHTO deleted north of Battery Tunnel
• Interstate 678 (New York): 1955 north of GCP (678); 1969 AASHO south end moved to I-495 (678); 1975 FHWA/AASHTO south end moved to JFK (678)
• Interstate 878 (New York): 1955 (78); 1969 AASHO I-278 to I-295 (878)

Interstate 79

• 1955 Washington to Pittsburgh (70; also 79 in 1961); 1970 FHWA/AASHO swapped with I-279
• 1955 I-90 to US 20? (179; soon 79)
• 1957 FHWA north of Pittsburgh (79)
• 1961 south of Washington (79)
• 1984 AASHTO US 20? to PA 5 (79)
• Interstate 279 (Pennsylvania): 1955 (279); 1970 FHWA/AASHO swapped with I-79
• Interstate 579 (Pennsylvania): when? (479); 1970 FHWA/AASHO (876); 1971 AASHO/1972 FHWA (579); 1979 FHWA deleted unbuilt south end

Interstate 80

• 1955 (80, 80N; all 80 by 1962 with Norwalk to I-71 deleted and east of I-71 becoming I-80S); by 1964 moved onto Ohio Turnpike east of I-480; 1965? FHWA truncated to I-280 in SF; 1970 FHWA/AASHO moved onto Ohio Turnpike between I-480 ends; 1980 FHWA/AASHTO moved around Sacramento
• Interstate 180 (Illinois): FHWA 1967 (180)
• Interstate 180 (Nebraska): 1955 (180)
• Interstate 180 (Pennsylvania): 1983 FHWA/AASHTO (180)
• Interstate 180 (Wyoming): 1970 AASHO (180)
• Interstate 280 (California): 1955 (280); 1965? FHWA realigned in SF; 1981 FHWA truncated in SF
• Interstate 280 (Illinois-Iowa): 1955 (280) - note that originally this would not have rejoined I-80 at the east end - could this be why some maps show 280 on 680 at the other end of Iowa?
• Interstate 280 (New Jersey): 1955 (280) - note continuation west to I-287
• Interstate 280 (Ohio): by 1957 (by which time I-80 was on the Ohio Turnpike) (77, but then 280 later in 1957)
• Interstate 380 (California): 1968 FHWA/1969 AASHO (380)
• Interstate 380 (Iowa): 1968 FHWA/1969 AASHO (380); 1981 FHWA deleted end in Waterloo
• Interstate 380 (Pennsylvania): 1955 (81E); 1972 AASHO (380)
• Interstate 480 (California): 1955 (480); 1965? FHWA deleted
• Interstate 480 (Iowa-Nebraska): 1955 (480) - originally a spur in Nebraska only; was it connected to I-29 in 1957 FHWA?
• Interstate 480 (Ohio): 1955 east of I-71 (80N, 271); by 1962 entire length (80); 1970 AASHO (480)
• Interstate 580 (California): 1955 south of Oakland (5W); 1964 FHWA (580); 1978 FHWA/AASHTO north of Oakland (180); 1983 FHWA/AASHTO (all 580)
• Interstate 580 (Nebraska): 1975 (at least partly) FHWA/1976 AASHTO (580), 1979 FHWA deleted
• Interstate 580 (Nevada): 1978 FHWA/AASHTO north of US 395 Reno Airport (580) - FHWA is only north of Mill Street; 1984 AASHTO north of US 395 Carson City (580)
• Interstate 680 (California): 1955 south of I-780 (680); 1973 FHWA north of I-780 (680)
• Interstate 780 (California): 1955 (680); 1973 FHWA (780)
• Interstate 680 (Iowa-Nebraska): 1955 (680, 80N); 1973 AASHTO (all 680)
• Interstate 680 (Ohio): 1955? (680)
• Interstate 880 (California): 1957/1958 FHWA (880); 1980 FHWA/AASHTO (80)
• Interstate 880 (California): 1983 FHWA/AASHTO (880)
• Interstate 980 (California): 1976 FHWA/AASHTO (980)
• Interstate 238 (California): 1983 FHWA/AASHTO (238)

Interstate 81

• 1955 (81)
• Interstate 381 (Virginia): 1955 (381)
• Interstate 481 (New York): 1957 FHWA southeast quarter (281); 1969 AASHO (481); 1978 legislated northeast quarter (481)
• Interstate 581 (Virginia): 1955 (581)
• Interstate 781 (New York): 2009 AASHTO (781)
• unknown Scranton belt: 1957 FHWA

Interstate 82

• 1957 FHWA (82)
• Interstate 182 (Washington): 1968 FHWA/1969 AASHO (182)

Interstate 83

• 1955 (83); 1983 FHWA deleted unbuilt end
• Interstate 283 (Pennsylvania): 1955 (283) - very different alignment

Interstate 84 (west)

• 1955 west of Ogden (80N); 1976 FHWA deleted from Mount Hood inside I-205; 1977 AASHTO (84); 1984 FHWA added to Banfield inside I-205 (84)
• 1957 FHWA east of Ogden (80N); 1977 AASHTO (84)
• Interstate 184 (Idaho): 1970 AASHO (180); 1979 AASHTO (184)

Interstate 84 (east)

• 1955 (84); 1969 AASHO east of Hartford renumbered (86); 1972 AASHO extended west over I-380 to I-81; 1984 AASHTO east of Hartford renumbered (84)
• 1968 FHWA/1969 AASHO Hartford to Providence (82, AASHO always calls it 84 but FHWA says it was 82 until 1971); 1975 or 1983 FHWA deleted in CT; 1983 FHWA/AASHTO deleted in RI west of I-295; when? deleted east of I-295
• Interstate 284 (Connecticut): 1975 FHWA (trade-in for I-86/I-291)/1976 AASHTO (284); 1983 FHWA deleted
• Interstate 384 (Connecticut): 1968 FHWA/1969 AASHO (84); 1984 AASHTO (384)
• Interstate 484 (Connecticut): when? (484); 1983 FHWA deleted
• Interstate 684 (Connecticut-New York): 1955 (87) - but 87 was initially on the Thruway north of Suffern at least through 1957; by 1959 moved to the east side of the Hudson (87); when? moved farther east (87); 1969 FHWA/AASHO (684)

Interstate 85

• 1955 north of Montgomery (85); 1995 AASHTO moved around Spartanburg; 1996 AASHTO moved off SR 13 in Atlanta; 2004 AASHTO moved around Greensboro; 2010 AASHTO moved around Montgomery and extended to I-59 (85)
• Interstate 185 (Georgia): 1968 FHWA/1969 AASHO north of SR 22 (185); 1984 FHWA/AASHTO south of SR 22 (185)
• Interstate 185 (South Carolina): 1955 north of I-85 (185) - would have connected to I-385 in 1955; 2000 AASHTO south of I-85 (185)
• Interstate 285 (Georgia): 1955 (285)
• Interstate 285 (North Carolina): 2003 AASHTO (185, denied); 2005 AASHTO (285, denied)
• Interstate 385 (South Carolina): 1955 north of I-85 (385) - would have connected to I-185 in 1955; 1984 FHWA/AASHTO south of I-85 (385)
• Interstate 485 (Georgia): 1970 AASHO (485); 1975 AASHTO deleted
• Interstate 485 (North Carolina): 1988 AASHTO southeast quarter (485); 1996 AASHTO remainder (485)
• Interstate 585 (South Carolina): 1955 (585) - very different alignment in 1955
• Interstate 685 (Alabama): 1955 (85); 2010 AASHTO (685)
• Interstate 785 (North Carolina-Virginia): 1997 AASHTO (785)
• Interstate 985 (Georgia): 1984 FHWA/AASHTO (985)
• unknown spur into Montgomery: 1955

Interstate 86 (west)

• 1955 (15W); 1977 AASHTO (86)
• unknown spur into Pocatello: 1955

Interstate 86 (east)

• legislated/1998 AASHTO (86)

Interstate 87

• 1955 (87) - note that in 1955 this was on the Thruway north of Suffern, not east of the Hudson as it was later, but it was moved east of the Hudson by 1959 and to I-684 by 1964; 1969 FHWA/AASHO moved back to Thruway north of Suffern
• Interstate 287 (New Jersey-New York): 1955 (95, 287, 487; soon only 95, 287); 1984 AASHTO (all 287)
• Interstate 487 (New York): by 1959 (87), when? (487), when? deleted
• Interstate 587 (New York): 1955 (587)
• Interstate 687 (New York): when? (687); 1978 FHWA deleted
• Interstate 787 (New York): 1955 (787)

Interstate 88 (west)

• FHWA/1987 AASHTO (88)

Interstate 88 (east)

• 1968 FHWA/1969 AASHO (88)

Interstate 89

• 1955 (89)
• Interstate 189 (Vermont): 1955 (189)

Interstate 90

• 1955 west of I-695 (90, 94) - note that east of I-787 is missing in 1955, but was soon added, presumably replacing the Berkshire Connector; 1964? swapped with 94; 1977 FHWA/AASHTO moved off I-290 in Chicago - what about west of I-5?
• 1974 FHWA or 1990 FHWA I-695 to I-93; 1974 FHWA east of I-93 (realignment of I-95)
• Interstate 190 (Illinois): 1978 FHWA/AASHTO (190, denied by AASHTO)
• Interstate 190 (Massachusetts): when? (190)
• Interstate 190 (New York): 1955 (90N; 190 by 1964)
• Interstate 190 (South Dakota): 1955 (190)
• Interstate 290 (Illinois): 1955 (90); 1977 AASHTO (290)
• Interstate 290 (Massachusetts): 1955 (290)
• Interstate 290 (New York): 1955 (290)
• Interstate 390 (New York): 1971 FHWA (per Kurumi) (part trade-in for other routes, part Howard-Cramer) south of I-590 (390); 1973 AASHTO Rochester loop (590); 1979 AASHTO west half of Rochester loop (390)
• Interstate 490 (Illinois): 2014 AASHTO (490)
• Interstate 490 (New York): 1955 (490)
• Interstate 490 (Ohio): 1955 curving southeast to I-480 (80N) - note that the I-90 merge was west of I-71; by 1962 straight east to I-271 (290); 1973 AASHTO east end moved back to I-480 (490); 1979 FHWA deleted east of I-77
• Interstate 590 (New York): 1973 AASHTO (part trade-in for other routes, part Howard-Cramer) full south half of loop (590)
• Interstate 690 (New York): 1955 (690)
• Interstate 790 (New York): 1955 (790)
• Interstate 890 (New York): 1955 (890)
• Interstate 990 (New York): 1978 legislated/1980 AASHTO south of NY 299 (990); 1993 FHWA/AASHTO remainder (990)

Interstate 91

• 1955 (91)
• Interstate 291 (Connecticut): 1957 FHWA? west of I-91 (291); 1968 FHWA/1969 AASHO northeast quarter (291); 1975 FHWA deleted northwest quarter - southwest quarter became 491!; 1980 FHWA deleted southwest quarter
• Interstate 291 (Massachusetts): 1955 (291)
• Interstate 391 (Massachusetts): 1957 FHWA (391)
• Interstate 491 (Connecticut): 1955 (491); 1969 AASHO (86); 1975 FHWA/1976 AASHTO deleted
• Interstate 691 (Connecticut): 1975 FHWA (trade-in for I-86/I-291)/1976 AASHTO (Howard-Cramer) (691)

Interstate 93

• 1955 north of I-695 (93 - is 89 south of Concord a typo or just a very early change?); 1974 FHWA/1975 AASHTO/1983 FHWA north of Braintree (93); 1974 FHWA/1975 AASHTO south of Braintree (93)
• Interstate 293 (New Hampshire): 1955 south of Everett Turnpike (193) - note that in 1955 its west end, not east end, was at I-93; 1976 FHWA/AASHTO extended and renumbered (293)
• Interstate 393 (New Hampshire): 1976 AASHTO (393)

Interstate 94

• 1955 (94, 77, 90, 92; soon just 94, 77, 90, and apparently just 90, 94 in 1958) - note that in 1955 Detroit had a piece of 77 that was never built, from 75 northeast to 92; 1964? swapped with 90
• Interstate 194 (Michigan): 1955 (194)
• Interstate 194 (North Dakota): when? (194)
• Interstate 294 (Illinois): 1955 (294)
• Interstate 394 (Minnesota): 1968 FHWA/1969 AASHO (894, renumbered 394 in 1969 before AASHO)
• Interstate 494 (Illinois): 1957 FHWA? (494); 1977-79 FHWA deleted
• Interstate 494 (Minnesota): 1955 (494)
• Interstate 694 (Minnesota): 1955 (694)
• Interstate 794 (Wisconsin): 1964 FHWA (794)
• Interstate 894 (Wisconsin): 1955 (894)

Interstate 95

• 1955 (95); 1974-75 FHWA/AASHTO moved to 128 (95); 1975 FHWA/AASHTO deleted I-295 to I-495 - Maryland is missing from FHWA; 1981 FHWA deleted I-695 to I-287; 1983 legislated/1983 FHWA/1985 AASHTO deleted I-295 to I-287; 1986 FHWA Richmond-Petersburg Turnpike readded; 2002 AASHTO swapped with I-495 Maine
• Interstate 195 (Florida): 1955 on MacArthur Causeway to Miami Beach but apparently shifted north soon (195)
• Interstate 195 (Maine): 1955 (195)
• Interstate 195 (Maryland): 1975 FHWA/AASHTO (part trade-in for other routes, part Howard-Cramer) (195)
• Interstate 195 (Massachusetts-Rhode Island): 1955 west of New Bedford (95E; 195 by 1964); 1975 FHWA/AASHTO east of New Bedford (195)
• Interstate 195 (New Jersey): 1968 AASHO (part trade-in for I-278, part Howard-Cramer) (195); 2007 AASHTO extended to I-276 (195)
• Interstate 195 (Virginia): 1969 AASHO (195); 1986 AASHTO again! (195)
• Interstate 295 (Delaware-New Jersey): 1955 (295)
• Interstate 295 (Florida): 1957 FHWA west half (295); 2009 AASHTO east half (295)
• Interstate 295 (Maine): 1955 (295); 2002 AASHTO extended north along former I-95
• Interstate 295 (District of Columbia-Maryland): 1955 (295); 2009 AASHTO north end became I-695
• Interstate 295 (Massachusetts-Rhode Island): 1955 (295)
• Interstate 295 (New York): 1955 (78); 1969 AASHO I-878 to I-95 (295)
• Interstate 295 (North Carolina): 2003 AASHTO (195, denied); 2005 AASHTO (295)
• Interstate 295 (Virginia): 1955 (295); when? east half became I-95; 1986 FHWA/AASHTO went back to being I-295
• Interstate 395 (Connecticut-Massachusetts): 1983 FHWA/AASHTO (395)
• Interstate 395 (District of Columbia-Virginia): 1955 (95); 1975 FHWA/AASHTO ending at I-295 (395 tentative, confirmed 1976); 1978 FHWA deleted unbuilt end
• Interstate 395 (Florida): 1964 FHWA (395) - note that 1955 plan had 395 but not 195
• Interstate 395 (Maine): 1955 (395)
• Interstate 395 (Maryland): 1970 AASHO (395)
• Interstate 495 (Delaware): 1955 (495); some temporary strangeness in the late 1970s
• Interstate 495 (Maine): 1987 FHWA/AASHTO (495); 2002 AASHTO swapped with I-95
• Interstate 495 (Maryland-Virginia): 1955 (495); 1975 AASHTO east half became I-95; 1991 AASHTO restored as overlap on east half
• Interstate 495 (Massachusetts): 1955 west of I-95 (495) - but it's along 128 in 1955; 1974 FHWA/1975 AASHTO (Howard-Cramer) I-95 to Route 24 (495); 1975 FHWA/AASHTO Route 24 to I-195 (495)
• Interstate 495 (New Jersey-New York): 1955 west of I-295 (495); 1969 AASHO deleted NJ to I-278; 1971 FHWA restored Queens Midtown Tunnel to I-278 (495); 1979 FHWA/1980 AASHTO deleted in NJ; 1979 FHWA deleted I-278 to I-678!; 1983 FHWA/1984 AASHTO west of NY 25 (495); 1986 AASHTO deleted Lincoln Tunnel
• Interstate 495 (North Carolina): 2013 AASHTO (495)
• Interstate 595 (Florida): 1978 AASHTO east of US 441 (595); 1990 FHWA west of US 441 (595)
• Interstate 595 (Maryland): 1975 AASHTO (part trade-in for other routes, part Howard-Cramer) (97, 197); 1981 AASHTO (68, 168); 1982 AASHTO (68); 1989 AASHTO (595)
• Interstate 595 (Virginia): when? (595); 1982 FHWA deleted
• Interstate 695 (District of Columbia): 1955 east of I-395 (695); 1957 FHWA? west of I-395 (695); 1980 FHWA deleted west of I-395; 2009 AASHTO extended south along I-295
• Interstate 695 (Maryland): 1955 except I-95 north to MD 2 south (695); 1975 AASHTO/1976 FHWA MD 2 to MD 10 per AASHTO or MD 295 to MD 3 per FHWA (695) - the rest is still not officially I-695
• Interstate 695 (Massachusetts): 1955 (695); 1974 FHWA deleted
• Interstate 695 (New Jersey): when? (695); 1981 FHWA (95); 1983 FHWA deleted
• Interstate 695 (New York): 1969 AASHO Queens Interborough Expressway I-878 to I-278 (695); when? deleted
• Interstate 695 (New York): when? (78); 1969 AASHO (295); 2008 AASHTO (695)
• Interstate 695 (Pennsylvania): 1957 FHWA (confirmed by Phillyroads) (695); 1974 FHWA deleted
• Interstate 795 (Maryland): 1979 AASHTO southeast of Owings Mills (795); 1984 AASHTO/1991 FHWA remainder (795)
• Interstate 795 (North Carolina): 2007 AASHTO (795, denied; approved 2007 other meeting)
• Interstate 895 (Maryland): 1955? (895) - 1955 map shows a full beltway; note that it's officially only an Interstate inside I-695
• Interstate 895 (Massachusetts-Rhode Island): 1968 FHWA/1969 AASHO (295, renumbered to 895 - AASHO always has 895, but FHWA says it was 295 until 1971); 1973 FHWA deleted northeast quarter; 1982-83 FHWA/1983 AASHTO deleted southeast quarter
• Interstate 895 (New Jersey-Pennsylvania): 1968 FHWA (895); 1980 FHWA deleted
• Interstate 895 (New York): 1955 (278); 1969 AASHO only south of Cross Bronx (895)

Interstate 96

• 1955 (94, 94N; quickly 96, 196); 1969 AASHO swapped with 196
• Interstate 196 (Michigan): 1955 (94; quickly 96); 1969 AASHO swapped with 96
• Interstate 296 (Michigan): 1955 (296) - originally a larger western bypass of Grand Rapids; 1979 AASHTO signage eliminated
• Interstate 496 (Michigan): 1955 (496)
• Interstate 696 (Michigan): 1955 (696); 1988 AASHTO US 24 to I-75 why? (696)

Interstate 97

• 1975 AASHTO (part trade-in for other routes, part Howard-Cramer) (97)
• Interstate 297 (Maryland): 1975 FHWA/AASHTO (Howard-Cramer) (297); 1983 FHWA deleted

Interstate 99

• legislated/1998 AASHTO I-76 to PA 350 (99)
• when? PA 350 to NY (99)
• 2014 AASHTO Pennsylvania to I-86 (99)

Alaska

• 1982 AASHTO (A1 to A4)

Hawaii

• 1960 FHWA (H-1 to H-3)
• Interstate H-201 (Hawaii): 1989 FHWA/1990 AASHTO (H-1A withheld; H-201 approved at other 1990 meeting)

Puerto Rico

• 1983 AASHTO (PRI-1 to PRI-3)