Alpha chapter was founded at DePauw University in Greencastle, Indiana on October 15, 1885.

Beta chapter was founded at Albion College in Albion, Michigan on May 27, 1887.

Gamma chapter was founded at Northwestern University in Evanston, Illinois on November 14, 1890.

Delta chapter was founded at Allegheny College in Meadville, Pennsylvania on January 29, 1891.

Epsilon chapter was founded at University of Southern California in Los Angeles, California on June 16, 1895.

Zeta chapter was founded at New England Conservatory in Boston, Massachusetts on December 15, 1895. The chapter closed on June 1, 1950.

Eta chapter was founded at Bucknell University in Lewisburg, Pennsylvania on June 16, 1898. It was then closed the following year in June 1899. Eta Chapter re-opened on April 1, 1921.

Theta chapter was founded at University of Michigan in Ann Arbor, Michigan on on November 19, 1898.

Iota chapter was founded at University of Illinois at Urbana-Champaign in Urbana-Champaign, Illinois on December 8, 1899.

Kappa chapter was founded at University of Wisconsin - Madison in Madison, Wisconsin on December 18, 1903.

Lambda chapter was founded at Syracuse University in Syracuse, New York on December 18, 1906. The chapter closed on January 28, 2011 and was reopened on November 5, 2016.

Mu chapter was founded at Simpson College in Indianola, Iowa on May 13, 1907. The chapter closed on June 11, 2007.

Nu chapter was founded at University of Colorado Boulder in Boulder, Colorado on September 6, 1907. The chapter closed on June 26, 1973 and was reopened on January 26, 1979.

Xi chapter was founded at University of Nebraska - Lincoln in Lincoln, Nebraska on November 28, 1907.

Omicron chapter was founded at Baker University in Baldwin City, Kansas on September 17, 1908.

Pi chapter was founded at University of California, Berkeley in Berkeley, California on May 7, 1909. The chapter closed on June 26, 1973 and was reopened on February 5, 1978.

Rho chapter was founded at University of Washington in Seattle, Washington on October 14, 1910.

Sigma chapter was founded at University of Iowa in Iowa City, Iowa on June 13, 1911.

Tau chapter was founded at Brenau University in Gainesville, Georgia on November 24, 1911.

Upsilon chapter was founded at Millikin University in Decatur, Illinois on May 9, 1913.

Phi chapter was founded at University of Kansas in Lawrence, Kansas on September 15, 1914.

Chi chapter was founded at Oregon State University in Corvallis, Oregon on March 19, 1915.

Psi chapter was founded at The University of Oklahoma in Norman, Oklahoma on January 14, 1916.

Omega chapter was founded at Washington State University in Pullman, Washington on September 22, 1916.

Alpha Beta chapter was founded at Purdue University in West Lafayette, Indiana on April 26, 1918.

Alpha Gamma chapter was founded at The University of New Mexico in Albuquerque, New Mexico on June 6, 1918.

Alpha Delta chapter was founded at University of Cincinnati in Cincinnati, Ohio on April 25, 1919. The chapter closed on August 10, 2001.

Alpha Epsilon chapter was founded at University of Pennsylvania in Philadelphia, Pennsylvania on May 9, 1919. The chapter closed on June 1, 1969 and was reopened on March 3, 1990. The chapter closed again on May 9, 2016.

Alpha Zeta chapter was founded at Washington University in St. Louis in St. Louis, Missouri on June 8, 1920. The chapter closed on June 5, 1975 and was reopened on October 26, 1985. The chapter closed again on November 1, 1994.

Alpha Eta chapter was founded at University of Mount Union in Alliance, Ohio on June 11, 1920.

Alpha Theta chapter was founded at Drake University in Des Moines, Iowa on June 10, 1921. The chapter closed on October 19, 1933.

Alpha Iota chapter was founded at University of Vermont in Burlington, Vermont on June 14, 1921.

Alpha Kappa chapter was founded at University of Oregon in Eugene, Oregon on June 22, 1921.

Alpha Lambda chapter was founded at University of Minnesota in Minneapolis, Minnesota on September 30, 1921.

Alpha Mu chapter was founded at Indiana University in Bloomington, Indiana on April 21, 1922.

Alpha Nu chapter was founded at University of Missouri in Columbia, Missouri on August 25, 1922.

Alpha Xi chapter was founded at University of Montana in Missoula, Montana on May 11, 1923. The chapter closed on June 1, 1952.

Alpha Omicron chapter was founded at The Ohio State University in Columbus, Ohio on September 14, 1923.

Alpha Pi chapter was founded at University of North Dakota in Grand Forks, North Dakota on November 10, 1923. The chapter closed on May 1, 1938 and was reopened on February 17, 1968.

Alpha Rho chapter was founded at University of Idaho in Moscow, Idaho on May 9, 1924. The chapter closed on September 9, 1988.

Alpha Sigma chapter was founded at Ohio Wesleyan University in Delaware, Ohio on May 9, 1924. The chapter closed on February 28, 1977.

Alpha Tau chapter was founded at University of New Hampshire in Durham, New Hampshire on June 24, 1924.

Alpha Upsilon chapter was founded at The University of Alabama in Tuscaloosa, Alabama on September 9, 1924.

Alpha Phi chapter was founded at The University of Texas at Austin in Austin, Texas on September 13, 1924.

Alpha Chi chapter was founded at Butler University in Indianapolis, Indiana on February 28, 1925.

Alpha Psi chapter was founded at UCLA in Los Angeles, California on March 27, 1926. The chapter closed on October 3, 1996 and was reopened on November 14, 2009.

Alpha Omega chapter was founded at Birmingham-Southern College in Birmingham, Alabama on April 9, 1926.

Beta Gamma chapter was founded at Louisiana State University in Baton Rouge, Louisiana on October 29, 1926. The chapter closed on April 6, 1971.

Beta Delta chapter was founded at College of William & Mary in Williamsburg, Virginia on April 8, 1927.

Beta Epsilon chapter was founded at Michigan State University in East Lansing, Michigan on February 11, 1928.

Beta Zeta chapter was founded at Whitman College in Walla Walla, Washington on November 9, 1928. The chapter closed on September 9, 1983.

Beta Eta chapter was founded at Florida State University in Tallahassee, Florida on March 29, 1929.

Beta Theta chapter was founded at Lawrence University in Appleton, Wisconsin on February 20, 1930. The chapter closed on May 28, 1980.

Beta Iota chapter was founded at University of Toronto in Toronto, Ontario, Canada on April 23, 1930. The chapter closed on July 15, 1953.

Beta Kappa chapter was founded at University of Wyoming in Laramie, Wyoming on October 23, 1930. The chapter closed on September 17, 1979.

Beta Lambda chapter was founded at University of Arizona in Tucson, Arizona on October 29, 1930. The chapter closed on June 1, 1970 and was reopened on February 28, 1981. The chapter closed again on May 15, 2009 and was reopened once again on November 16, 2013.

Beta Mu chapter was founded at Pennsylvania State University in State College, Pennsylvania on April 8, 1932. The chapter closed on March 14, 2018.

Beta Nu chapter was founded at University of Utah in Salt Lake City, Utah on March 23, 1934.

Beta Xi chapter was founded at Utah State University in Logan, Utah on May 19, 1934.

Beta Omicron chapter was founded at Florida Southern College in Lakeland, Florida on November 11, 1936.

Beta Pi chapter was founded at Washington College in Chestertown, Maryland on May 21, 1937.

Beta Rho chapter was founded at American University in Washington, D.C. on June 3, 1937.

Beta Sigma chapter was founded at University of Georgia in Athens, Georgia on January 7, 1938.

Beta Tau chapter was founded at Miami University in Oxford, Ohio on December 13, 1941.

Beta Upsilon chapter was founded at Duke University in Durham, North Carolina on January 31, 1942. The chapter closed on January 22, 1976.

Beta Phi chapter was founded at Bowling Green State University in Bowling Green, Ohio on May 28, 1944.

Beta Chi chapter was founded at Willamette University in Salem, Oregon on June 10, 1944.

Beta Psi chapter was founded at Louisiana Tech University in Ruston, Louisiana on October 7, 1944.

Beta Omega chapter was founded at The University of Toledo in Toledo, Ohio on November 17, 1945.

Gamma Delta chapter was founded at University of Denver in Denver, Colorado on October 12, 1946. The chapter closed on October 20, 1987.

Gamma Epsilon chapter was founded at Oklahoma State University in Stillwater, Oklahoma on March 8, 1947.

Gamma Zeta chapter was founded at Kansas State University in Manhattan, Kansas on March 22, 1947.

Gamma Eta chapter was founded at San Jose State University in San Jose, California on March 10, 1948. The chapter closed on May 1, 1974.

Gamma Theta chapter was founded at University of Maryland in College Park, Maryland on October 30, 1948.

Gamma Iota chapter was founded at University of Florida in Gainesville, Florida on April 2, 1949.

Gamma Kappa chapter was founded at Idaho State University in Pocatello, Idaho on February 25, 1950. The chapter closed on November 19, 1984.

Gamma Lambda chapter was founded at Kent State University in Kent, Ohio on April 1, 1950. The chapter closed on January 28, 1973.

Gamma Mu chapter was founded at Ball State University in Muncie, Indiana on June 10, 1950.

Gamma Nu chapter was founded at San Diego State University in San Diego, California on November 18, 1950.

Gamma Xi chapter was founded at Western Michigan University in Kalamazoo, Michigan on April 21, 1951.

Gamma Omicron chapter was founded at Marshall University in Huntington, West Virginia on November 8, 1952.

Gamma Pi chapter was founded at University of Tampa in Tampa, Florida on January 20, 1954. The chapter closed on May 15, 1977 and was reopened on January 9, 1982.

Gamma Rho chapter was founded at Texas Tech University in Lubbock, Texas on March 6, 1954.

Gamma Sigma chapter was founded at University of Rhode Island in South Kingstown, Rhode Island on November 5, 1955. The chapter closed on October 21, 2013 and was rechartered on December 10, 2021. 

Gamma Tau Chapter was founded at Oklahoma City University in Oklahoma City, Oklahoma on December 3, 1955. The chapter closed on October 7, 1978 and was reopened on April 9, 1988.

Gamma Upsilon chapter was founded at University of Houston in Houston, Texas on February 11, 1956.

Gamma Phi chapter was founded at Lamar University in Beaumont, Texas on November 17, 1956.

Gamma Chi chapter was founded at Stetson University in DeLand, Florida on May 18, 1957.

Gamma Psi chapter was founded at Wichita State University in Wichita, Kansas on February 1, 1958. The chapter closed on April 17, 1984.

Gamma Omega chapter was founded at University of Miami in Miami, Florida on March 8, 1958. The chapter closed on June 1, 1970.

Delta Epsilon chapter was founded at Southeast Missouri State University in Cape Girardeau, Missouri on April 26, 1958.

Delta Zeta chapter was founded at Central Michigan University in Mount Pleasant, Michigan on November 8, 1958.

Delta Eta chapter was founded at Queens College in Queens, New York on March 7, 1959. The chapter closed on June 1, 1965.

Delta Theta chapter was founded at University of Maine in Orono, Maine on April 25, 1959. The chapter closed on October 19, 1988.

Delta Iota chapter was founded at Emory University in Atlanta, Georgia on May 9, 1959. The chapter closed on January 29, 1988.

Delta Kappa chapter was founded at Sam Houston State University in Huntsville, Texas on September 6, 1959.

Delta Lambda chapter was founded at Ripon College in Ripon, Wisconsin on October 31, 1959.

Delta Mu chapter was founded at University of Massachusetts in Amherst, Massachusetts on February 18, 1961.

Delta Nu chapter was founded at Iowa State University in Ames, Iowa on March 18, 1961.

Delta Xi chapter was founded at Denison University in Granville, Ohio on April 29, 1961. The chapter closed on June 1, 1969 and was reopened on April 12, 1986. The chapter closed again on October 12, 2008.

Delta Omicron chapter was founded at Portland State University in Portland, Oregon on May 13, 1961.

Delta Pi chapter was founded at University of Tennessee, Knoxville in Knoxville, Tennessee on October 21, 1961.

Delta Rho chapter was founded at University of Arkansas in Fayetteville, Arkansas on December 2, 1961. The chapter closed on May 31, 1977 and was reopened on November 10, 2012.

Delta Sigma chapter was founded at University of the Pacific in Stockton, California on March 10, 1962. The chapter closed on January 16, 1996.

Delta Tau chapter was founded at Minnesota State University, Mankato in Mankato, Minnesota on April 3, 1965.

Delta Upsilon chapter was founded at Colorado State University in Fort Collins, Colorado on October 16, 1965. The chapter closed on October 13, 1998.

Delta Phi chapter was founded at Texas A&I University (now Texas A&M University - Kingsville) in Kingsville, Texas on October 30, 1965. The chapter closed on March 9, 1978.

Delta Chi chapter was founded at William Woods University in Fulton, Missouri on November 20, 1965.

Delta Psi chapter was founded at University of California, Santa Barbara in Santa Barbara, California on December 4, 1965.

Delta Omega chapter was founded at University of Kentucky in Lexington, Kentucky on March 26, 1966. The chapter closed on March 10, 1976 and was reopened on November 7, 2015.

Epsilon Zeta chapter was founded at Auburn University in Auburn, Alabama on February 4, 1967.

Epsilon Eta chapter was founded at Stephen F. Austin State University in Nacogdoches, Texas on May 6, 1967.

Epsilon Theta chapter was founded at California State University, Sacramento in Sacramento, California on May 20, 1967.

Epsilon Iota chapter was founded at University of Northern Iowa in Cedar Falls, Iowa on March 2, 1968. The chapter closed on October 16, 1987.

Epsilon Kappa chapter was founded at California State University, Fullerton in Fullerton, California on December 7, 1968.

Epsilon Lambda chapter was founded at The University of Texas at Arlington in Arlington, Texas on February 15, 1969.

Epsilon Mu chapter was founded at Northern Illinois University in DeKalb, Illinois on February 28, 1970. The chapter closed on May 1, 1974.

Epsilon Nu chapter was founded at Boise State University in Boise, Idaho on March 7, 1970.

Epsilon Xi chapter was founded at University of Nevada, Reno in Reno, Nevada on March 6, 1971. The chapter closed on August 26, 1991.

Epsilon Omicron chapter was founded at Indiana State University in Terre Haute, Indiana on March 20, 1971.

Epsilon Pi chapter was founded at Georgia Southwestern State University in Americus, Georgia on February 5, 1972. The chapter closed on December 15, 1987.

Epsilon Rho chapter was founded at University of Delaware in Newark, Delaware on February 26, 1972. The chapter closed on October 31, 2002.

Epsilon Sigma chapter was founded at University of Central Florida in Orlando, Florida on February 10, 1973. The chapter closed on April 4, 1984.

Epsilon Tau chapter was founded at Virginia Tech in Blacksburg, Virginia on March 31, 1973. The chapter closed on January 1, 1988 and was reopened on November 7, 1998.

Epsilon Upsilon chapter was founded at Mississippi State University in Starkville, Mississippi on April 6, 1974. The chapter closed on March 23, 1984 and was rechartered on April 1, 2021.

Epsilon Phi chapter was founded at Georgia Institute of Technology in Atlanta, Georgia on February 22, 1975.

Epsilon Chi chapter was founded at University of North Carolina at Chapel Hill in Chapel Hill, North Carolina on January 22, 1977.

Epsilon Psi chapter was founded at University of California, Irvine in Irvine, California on January 29, 1977.

Epsilon Omega chapter was founded at Cal Poly, San Luis Obispo in San Luis Obispo, California on April 15, 1978.

Zeta Eta chapter was founded at Bradley University in Peoria, Illinois on May 6, 1978.

Zeta Theta chapter was founded at Brown University in Providence, Rhode Island on May 5, 1979.

Zeta Iota chapter was founded at Stanford University in Palo Alto, California on October 27, 1979. The chapter closed on May 1, 1982 and reopened on June 3, 2017.

Zeta Kappa chapter was founded at New Mexico State University in Las Cruces, New Mexico on November 10, 1979. The chapter closed on February 18, 1995.

Zeta Lambda chapter was founded at University of Virginia in Charlottesville, Virginia on April 19, 1980.

Zeta Mu chapter was founded at Dartmouth College in Hanover, New Hampshire on November 22, 1980. The chapter closed on March 20, 1990.

Zeta Nu chapter was founded at Texas A&M University in College Station, Texas on May 8, 1981.

Zeta Xi chapter was founded at University of North Carolina at Greensboro in Greensboro, North Carolina on March 20, 1982.

Zeta Omicron chapter was founded at Vanderbilt University in Nashville, Tennessee on April 17, 1982.

Zeta Pi chapter was founded at Arizona State University in Tempe, Arizona on September 25, 1982.

Zeta Rho chapter was founded at Northwood University in Midland, Michigan on January 15, 1983.

Zeta Sigma chapter was founded at Missouri State University in Springfield, Missouri on April 15, 1983.

Zeta Tau chapter was founded at Villanova University in Villanova, Pennsylvania on June 25, 1983.

Zeta Upsilon chapter was founded at Case Western Reserve University in Cleveland, Ohio on September 24, 1983.

Zeta Phi chapter was founded at Cornell University in Ithaca, New York on February 4, 1984.

Zeta Chi chapter was founded at Muhlenberg College in Allentown, Pennsylvania on October 27, 1984.

Zeta Psi chapter was founded at Loyola University New Orleans in New Orleans, Louisiana on November 10, 1984.

Zeta Omega chapter was founded at Western Carolina University in Cullowhee, North Carolina on April 20, 1985.

Theta Iota chapter was founded at Baylor University in Waco, Texas on April 27, 1985.

Theta Kappa chapter was founded at University of Memphis in Memphis, Tennessee on April 27, 1985. The chapter closed on February 29, 1996.

Theta Lambda chapter was founded at Clemson University in Clemson, South Carolina on October 19, 1985.

Theta Mu chapter was founded at Eastern Montana College (now Montana State University Billings) in Billings, Montana on November 23, 1985. The chapter closed on February 12, 1994.

Theta Nu chapter was founded at Santa Clara University in Santa Clara, California on February 8, 1986. The chapter closed on April 6, 1995.

Theta Xi chapter was founded at California State University, Northridge in Northridge, California on March 8, 1986. The chapter closed on October 31, 1991.

Theta Omicron chapter was founded at Massachusetts Institute of Technology in Boston, Massachusetts on April 26, 1986.

Theta Pi chapter was founded at University of California, Davis in Davis, California on June 7, 1986.

Theta Rho chapter was founded at James Madison University in Harrisonburg, Virginia on March 28, 1987. The chapter closed on April 2, 2000.

Theta Sigma chapter was founded at University of North Florida in Jacksonville, Florida on May 2, 1987.

Theta Tau chapter was founded at Rutgers University in New Brunswick, New Jersey on February 20, 1988. The chapter closed on July 31, 2013 and was re-opened on May 4, 2019.

Theta Upsilon chapter was founded at University of South Carolina in Columbia, South Carolina on March 26, 1988.

Theta Phi chapter was founded at Colgate University in Hamilton, New York on March 12, 1988. The chapter closed on February 21, 1997.

Theta Chi chapter was founded at Lehigh University in Bethlehem, Pennsylvania on February 11, 1989. The chapter closed on March 6, 2018.

Theta Psi chapter was founded at Columbia University in New York, New York on April 1, 1989.

Theta Omega chapter was founded at Marquette University in Milwaukee, Wisconsin on April 15, 1989.

Iota Alpha chapter is a chapter made up of alumnae initiates.

Iota Kappa chapter was founded at Eastern Kentucky University in Richmond, Kentucky on September 28, 1990. The chapter closed on September 1, 1993.

Iota Lambda chapter was founded at Texas Christian University in Fort Worth, Texas on March 2, 1991.

Iota Mu chapter was founded at University of Richmond in Richmond, Virginia on April 20, 1991. The chapter closed on November 17, 2010.

Iota Nu chapter was founded at University of California San Diego in La Jolla, California on May 9, 1992.

Iota Xi chapter was founded at University of California, Riverside in Riverside, California on May 16, 1992.

Iota Omicron chapter was founded at University of Lynchburg in Lynchburg, Virginia on April 3, 1993.

Iota Pi chapter was founded at Houston Baptist University in Houston, Texas on November 18, 1993.

Iota Rho chapter was founded at Loyola University Chicago in Chicago, Illinois on November 20, 1993.

Iota Sigma chapter was founded at Southern Methodist University in Dallas, Texas on April 23, 1994.

Iota Tau chapter was founded at California State University San Marcos in San Marcos, California on March 18, 1995.

Iota Upsilon chapter was founded at Southern Illinois University Carbondale in Carbondale, Illinois on February 22, 1997. The chapter closed on May 11, 2001.

Iota Phi chapter was founded at Quinnipiac University in Hamden, Connecticut on April 5, 1997.

Iota Chi chapter was founded at Middle Tennessee State University in Murfreesboro, Tennessee on April 21, 2001.

Iota Psi chapter was founded at Elon University in Elon, North Carolina on November 17, 2001.

Iota Omega chapter was founded at Carthage College in Kenosha, Wisconsin on April 23, 2005.

Kappa Lambda Chapter was founded at University of San Diego in San Diego, California on November 12, 2005.

Kappa Mu chapter was founded at University of Texas at Tyler in Tyler, Texas on April 22, 2006.

Kappa Nu chapter was founded at Carnegie Mellon University in Pittsburgh, Pennsylvania on April 29, 2006.

Kappa Xi chapter was founded at University of West Florida in Pensacola, Florida on November 11, 2006.

Kappa Omicron chapter was founded at High Point University in High Point, North Carolina on March 30, 2012.

Kappa Pi chapter was founded at University of North Carolina Wilmington in Wilmington, North Carolina on November 17, 2012.

Kappa Rho chapter was founded at University of North Carolina at Charlotte in Huntersville, North Carolina on November 15, 2014.

Kappa Sigma chapter was founded at The University of Southern Mississippi in Hattiesburg, Mississippi on November 15, 2014.

Kappa Tau chapter was founded at University of Connecticut in Storrs Mansfield, Connecticut on November 15, 2014.

Kappa Upsilon chapter was founded at Florida International University in Miami, Florida on December 6, 2014.

Kappa Phi chapter was founded at Loyola Marymount University in Los Angeles, California on April 18, 2015.

Kappa Chi chapter was founded at Florida Gulf Coast University in Fort Myers, Florida on November 7, 2015.

Kappa Psi chapter was founded at Western Oregon University in Monmouth, Oregon on March 12, 2016.

Kappa Omega chapter was founded at Indiana University-Purdue University Indianapolis in Indianapolis, Indiana on April 2, 2016.

Lambda Mu chapter was founded at Trinity College in Hartford, Connecticut on November 4, 2017.

Lambda Nu chapter was established at Northeastern University in Boston, Massachusetts on April 6, 2019.

Lambda Xi chapter was founded at Augusta University in Augusta, Georgia on November 16, 2019.

Lambda Omicron chapter was founded at Chapman University in Orange, California on April 8, 2022.

Lambda Pi chapter was founded at the University of Mississippi in Oxford, Mississippi on October 29, 2022.