This is the list of Chi Omega chapters. Chi Omega's first series chapters (single-letter) are named for 24 of the Greek letters and assigned in an order customized to Chi Omega, approximating a reverse alphabetical order. The Omega chapter is reserved as a memorial designation; subsequent chapters have likewise not been assigned using the letter Omega in their names. Each subsequent series, (Alpha Alpha series, Alpha Beta series, where the second letter marks the name of the series) follow generally that same naming convention established with the first series, thus beginning with a Psi chapter and naming its chapters through Alpha. For purposes of this table, where a single prospective chapter name went unused in a series, it is shown in its assumed place within that series, and marked as unassigned. The Alpha Epsilon series was only partly used: this occurring in the early 1950s, with 17 of those names unassigned (including Omega). The Alpha Eta series was not used, with all of its 24 names unassigned (including Omega). The Alpha Iota series was not used, likewise with all 24 names unassigned (including Omega). The most recent chapter names assigned have been in the Alpha Mu series.
Since Chi Omega's founding, eight chapter names have been reassigned, with the last of these occurring in 1943.[a]
^When a name is reassigned, the former chapter is named with the appended word "(Old)". Hence, "Chi (Old)". In seven of the eight cases no further chapter activity has occurred on the earlier campuses. The only exception is at Oglethorpe, site of Sigma Gamma (Old). 26 years after the closure of the original Sigma Gamma (Old) chapter a new Oglethorpe chapter was established, but was forced to use a new name. --At the time, the reassigned, or "new" Sigma Gamma chapter was active, thus the Oglethorpe group's earlier name couldn't be repurposed to its original school.
^Jessamine Female Institute closed sometime between 1899 and 1902.
^Likely the first international chapter of any NPC sorority, this school was affiliated with neighboring Hellmuth College, a men's school. Both are long-dormant.
^Hellmuth Women's [Ladies] College, and the men's college to which it was attached, closed in 1901.
^Originated as Sigma Epsilon (local), which had formed prior to 1899.
^Originated as Sigma Tau (local), which had formed in 1896.
^While the chapter was active, this school was known as Randolph-Macon Woman's College.
^Originated as Sigma Delta (local), which had formed in 1898.
^ abGeorge Washington University was named Columbian University for its first 80 years. One year after the establishment of Phi Alpha chapter the school was given its current name, George Washington University. The chapter's charter and earliest documents will reflect the earlier school name.
^Originated as Phi Alpha (local), which had formed in 1901.
^ abUnion University was still called Southwestern Baptist University for three years after establishment of Upsilon chapter. It changed its name to Union University in 1907, in response to the gift of a substantial library collection from a donor.
^At its 1924 revival, this chapter formed by absorbing the Sigma Phi chapter of Sigma Sigma Sigma, which itself had been named after its earlier local, Sigma Phi, formed in 1905. The ΣΣΣ chapter was in place between 1909 and 1924.
^Originated as Sigma Tau (local), which had formed in 1902.
^Originated as Theta Sigma (local), which had formed in 1904.
^Originated as Phi Pi Alpha (local), which had formed in 1899.
^Originated as Phi Epsilon (local), which had formed in 1901.
^ abGreek organizations were banned at Colby College in 1984.
^Originated as Phi Beta (local), which had formed in 1900.
^Originated as the X Club (local), which had formed in 1900.
^Originated as Omega Psi (local), which had formed in 1899.
^Originated as Beta Rho (local), which had formed in 1904.
^Originated as Alpha Gamma (local), which had formed earlier in 1908.
^Originated as Zeta Iota Phi (local), which had formed in 1907.
^Originated as Alpha Kappa Gamma (local), which had formed in 1895.
^Originated as Rho Beta Upsilon (local), which had formed in 1904.
^Originated as the Alpha chapter of Pi Delta Kappa, a small regional (Ohio) sorority that had formed in 1907.
^Originated as the Beta chapter of Pi Delta Kappa in 1909. For a brief time prior to its merger into ΠΔΚ this group had been named Alpha Gamma Chi (local).
^Originated as Delta Rho (local), which had formed in 1909.
^Originated as Sigma Pi (local), which had formed in 1913.
^Originated as Theta Upsilon (local), which had formed in 1902.
^Originated as Mu Lambda (local), which had formed in 1913.
^Originated as Alpha Alpha Alpha (local), which had formed in 1894.
^Originated as the Longworthy Club (local), which had formed prior to 1915. At its 1991 reestablishment it absorbed Chi Alpha Pi (local), formed in 1990.
^Originated as Theta Chi (local), which had formed in 1914.
^Originated as Phi Kappa (local), which had formed in 1916.
^Originated as Zeta Alpha Omicron (local), which had formed earlier that year, on February 9, 1917.
^The Ohio State chapter was first organized in 1914 as the Beta chapter of Aloquin. It withdrew from that small state organization to operate locally, then chose to merge into Chi Omega in 1919.
^Originated as Phi Tau Delta (local), which had formed in 1914.
^Originated as Phi Sigma Phi (local), which had formed in 1918.
^Originated as Tau Gamma Kappa (local), which had formed in 1915.
^Originated as Gamma Alpha Theta (local), which had formed in 1918.
^Originated as Alpha Theta (local), which had formed in 1914.
^Originated as Kappa Chi (local), which had formed in 1918.
^Originated as Alpha Gamma Omicron (local), which had formed in 1917.
^Originated as Beta Kappa (local), which had formed in 1905.
^Originated as Kappa Chi (local), which had formed in 1917.
^Originated as Theta Xi (local), which had formed in 1917.
^Originated as Gamma Delta Phi (local), which had formed in 1907.
^Originated as Delta Phi (local), which had formed in 1920.
^Originated as Beta Sigma Chi (local), which had formed in 1920.
^Originated as Beta Gamma (local), which had formed in 1920.
^Originated as Sigma Tau (local), which had formed in 1920.
^Originated as Chi Beta (local), which had formed in 1920.
^Originated as Omicron Alpha Alpha (local), which had formed in 1917.
^Originated as Sigma Pi Gamma (local), which had formed in 1919.
^Originated as Sigma Phi Omega (local), which had formed in 1910.
^Originated as Zeta Alpha Beta (local), which had formed in 1921.
^Originated as Delta Mu (local), which had formed in 1920.
^Originated as Chi Delta Phi (local), which had formed in 1921.
^Originated as Kappa Chi (local), which had formed in 1922.
^Originated as Lambda Tau (local), which had formed in 1921.
^Originated as Phi Kappa Gamma (local), which had formed in 1917.
^Originated as Omega Theta (local), which had formed in 1919.
^Originated as Sigma Beta Delta (local), which had formed in 1921.
^Originated as Alpha Nu Sigma (local), which had formed in 1907.
^Originated as Alpha Alpha Gamma (local), which had formed in 1923.
^Originated as Gamma Sigma Rho (local), which had formed in 1921.
^Originated as Kappa Phi Sigma (local), which had formed in 1921.
^ abcTwo chapters have carried the name, Sigma Gamma chapter. The first, at Oglethorpe University originated as Sigma Alpha (local), which had formed in 1921. Several years after it closed in the midst of WWII, the name was re-assigned to a chapter at Davis & Elkins College. When a new group was formed at Oglethorpe, because the chapter's former name was then in use, the 1969-era Oglethorpe chapter was named Delta Theta chapter. This second Oglethorpe group was formed from a colony, which began in 1964.
^Originated as Lambda Mu (local), which had formed in 1922.
^Originated as Phi Theta Pi (local), which had formed in 1922.
^Originated as Kappa Gamma Chi (local), which had formed in 1890.
^Xi Gamma chapter's predecessor group began in 1924.
^Originated as the Alfrost Club (local), which had formed in 1923.
^Originated as Zeta Lambda Sigma (local), which had formed in 1867.
^Originated as Theta Sigma Phi (local), which had formed in 1927. At its re-establishment in 1977 it absorbed Omega Chi (local), formed earlier that year.
^Originated as Phi Omega (local), which had formed in 1922.
^Originated as Theta Alpha Pi (local), which had formed in 1926.
^Originated as Chi Omicron Beta (local), which had formed in 1927.
^Originated as Pi Delta Sigma (local), which had formed in 1925.
^Originated as Theta Beta Phi (local), which had formed in 1916.
^Originated as Beta Sigma (local), which had formed in 1921.
^Originated as Sigma Theta Phi (local), which had formed in 1912.
^Originated as Lambda Phi (local), which had formed in 1925.
^Originated as Pi Omega (local), which had formed in 1927.
^Originated as Tri Chi (local), which had formed in 1933.
^Originated as Phi Sigma (local), which had formed in 1933.
^Originated as Zeta Phi (local), which had formed in 1927.
^Originated as Gamma Phi (local), which had formed in 1923.
^Previously named Lake Forest University, this school changed its name to Lake Forest College in 1965.
^Originated as Gamma Rho Delta (local), which had formed in 1925.
^Originated as Delta Epsilon Beta (local), which had formed in 1933.
^Originated as the Khelth Samekh Club (local), which had formed in 1925.
^Originated as Pi Kappa Phi (local), which had formed in 1921. In 1999 the chapter withdrew from ΧΩ to operate as Kappa Phi Epsilon (local), then in 2011 it joined Alpha Sigma Tau to become its Epsilon Mu chapter.
^Originated as Lambda Delta Mu (local), which had formed in 1931.
^Originated as Alpha Chi Epsilon (local), which had formed in 1940.
^Originated as Alpha Kappa Psi (local), which had formed in 1910.
^Originated as Kappa Pi Epsilon (local), which had formed in 1912.
^Originated as Chi Omicron (local), which had formed in 1944.
^Originated as Delta Kappa (local), which had formed in 1916.
^Originated as Kappa Lambda (local), which had formed in 1946.
^Originated as Lambda Lambda Lambda (local), which had formed in 1945.
^Originated as Phi Sigma Theta (local), which had formed in 1919.
^Originated as Phi Sigma Theta (local), which had formed in 1919.
^Originated as Kappa Gamma Phi (local), which had formed in 1912.
^Originated as Pi Omega Pi (local), which had formed in 1922.
^Originated as Mu Omega (local), which had formed in 1937.
^Originated as Alpha (local), which had formed in 1889.
^Originated as Phi Kappa Gamma (local), which had formed in 1925.
^Originated as the Shyo Club (local), which had formed in 1921.
^Originated as Sigma Theta Phi (local), which had formed in 1916.
^Originated as Phi Kappa Delta (local), which had formed in 1912.
^Originated as Gamma Epsilon Sigma (local), which had formed in 1854.
^Originated as Psi Theta (local), which had formed in 1925.
^Originated as Kappa Theta Pi (local), which had formed in 1939.
^Originated as Delta Alpha Gamma (local), which had formed in 1921.
^Originated as The Ivy Club (local), which had formed in 1952.
^Originated as Chi Delta Delta (local), which had formed in 1944.
^Originated as Beta Chi (local), which had formed in 1941.
^Originated as Alpha Zeta Phi (local), which had formed in 1951.
^Originated as Gamma Phi (local), which had formed in 1936.
^Originated as Pi Sigma (local), which had formed in 1953.
^Originated as the Marpesa Club (local), which had formed in 1935.
^Originated as Kappa Delta Kappa (local), which had formed in 1959.
^Originated as Omega Chi (local), which had formed in 1960.
^Originated as Delta Pi Theta (local), which had formed in 1954.
^Originated as the Chi Chin Club (local), which had formed in 1953.
^Originated as Delta Pi Beta (local), which had formed in 1911.
^Originated as the Pine Burrs Club (local), formed in 1929.
^Originated as Zeta Alpha (local), which had formed in 1915.
^Originated as Theta Psi Delta (local), which had formed in 1903.
^Originated as Gamma Gamma (local), which had formed in 1938.
^Originated as Pi Kappa Epsilon (local), which had formed in 1956.
^Originated as Beta Gamma (local), which had formed in 1931.
^Originated as Beta Theta Chi (local), which had formed in 1935.
^Originated as Lambda Chi (local), which had formed in 1923.
^Originated as Kappa Theta Chi (local), which had formed in 1963.
^Originated as Lambda Phi Epsilon (local), which had formed in 1938.
^Originated as Alpha Eta (local), which had formed in 1965.
^Originated as Phi Gamma Chi (local), which had formed in 1967.
^Originated as Delta Pi Delta (local), which had formed in 1966.
^Originated as Theta Sigma Tau (local), which had formed in 1967.
^Originated as Lambda Phi Omega (local), which had formed in 1966.
^Originated as a colony, which had formed in 1968.
^Originated as Pi Alpha Lambda (local), which had formed in 1967.
^Originated as Sigma Beta Chi (local), which had formed in 1963.
^Originated as Lambda Tau Omega (local), which had formed in 1967.
^Originated as Phi Delta (local), which had formed in 1968.
^Originated as Omega Tau Omega (local), which had formed in 196x (?)
^Originated as Sigma Tau Omega (local), which had formed in 1968.
^Originated as Tau Delta Chi (local), which had formed in 19xx (?)
^Originated as Omega Chi Omega (local), which had formed in 1973.
^Originated as Pi Alpha Lambda (local), which had formed in 1940.
^Originated as Sigma Chi Omega (local), which had formed in 1978.
^Originated as the Third Edition Club (local), which had formed in 1986.
^Originated as Sigma Tau Epsilon (local), which had formed in 1983.
^Originated as Xi Delta Phi (local), which had formed in 19xx ?
^Originated as the Fidele Society (local), which had formed in 1961.
^Originated as the Chios Society (local), which had formed in 1984.
^Originated as Kappa Chi Omega (local), which had formed in 1965.
^Originated as The Rookies Club, which had formed in 1995.
^Originated as Chi Sigma Xi (local), which had formed in 1919.
^Originated as Kappa Chi Delta (local), which had formed in 1998.