| Alpha | 1925 | University of Illinois - Urbana Champaign |
| Beta | 1925 | Purdue University |
| Gamma | 1928 | University of Michigan |
| Delta | 1929 | University of Nebraska |
| Epsilon | 1949 | Iowa State University |
| Zeta | 1951 | Kansas State University |
| Eta | 1952 | University of Missouri - Rolla |
| Theta | 1962 | Michigan Tech University |
| Iota | 1962 | University of Missouri - Columbia |
| Kappa | 1963 | University of Minnesota |
| Lambda | 1964 | Western Michigan University |
| Mu | 1966 | Eastern Illinois University |
| Nu | 1967 | University of Kansas |
| Xi | 1967 | University of Nebraska - Kearney |
| Omicron | 1968 | Central Michigan State University |
| Pi | 1969 | Central Missouri State University |
| Rho | 1969 | University of Minnesota - Morris |
| Sigma | 1969 | Wayne State College |
| Tau | 1970 | Oklahoma State University |
| Upsilon | 1980 | Illinois State University |
| Phi | 1988 | Texas A&M University |
| Chi | 1999 | Ohio State University (Colony) |
| Psi | 1999 | Concordia College - New York |
| Omega | 2000 | Indiana University |
| Alpha-Alpha | 2001 | Midland Lutheran College |
