Beta Psi chapter was founded at Louisiana Tech University in Ruston, Louisiana on October 7, 1944.
Gamma Omega chapter was founded at University of Miami in Miami, Florida on March 8, 1958. The chapter closed on June 1, 1970.
Gamma Omicron chapter was founded at Marshall University in Huntington, West Virginia on November 8, 1952.
Gamma Phi chapter was founded at Lamar University in Beaumont, Texas on November 17, 1956.
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 Psi chapter was founded at Wichita State University in Wichita, Kansas on February 1, 1958. The chapter closed on April 17, 1984.
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 Theta chapter was founded at University of Maryland in College Park, Maryland on October 30, 1948.
Gamma Upsilon chapter was founded at University of Houston in Houston, Texas on February 11, 1956.
Gamma Xi chapter was founded at Western Michigan University in Kalamazoo, Michigan on April 21, 1951.
Gamma Zeta chapter was founded at Kansas State University in Manhattan, Kansas on March 22, 1947.
Iota chapter was founded at University of Illinois at Urbana-Champaign in Urbana-Champaign, Illinois on December 8, 1899.
Iota Alpha chapter is a chapter made up of alumnae initiates.
Iota Chi chapter was founded at Middle Tennessee State University in Murfreesboro, Tennessee on April 21, 2001.
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.
