[AlphaSigOU]

Alpha Sigma Phi's single-letter chapters:

Alpha: Yale University, New Haven, Connecticut (1845)
Beta: Harvard University, Cambridge, Massachusetts (1850)
Gamma: University of Massachusetts Amherst, Masachusetts (1854)
Delta: Marietta College, Marietta, Ohio (1860)
Epsilon: Ohio Wesleyan University, Delaware, Ohio (1863)
Zeta: Ohio State University, Columbus, Ohio (1909)
Eta: University of Illinois, Champaign-Urbana, Illinois (1908)
Theta: University of Michigan, Ann Arbor, Michigan (1908)
Iota: Cornell University,Ithaca, New York (1909)
Kappa: University of Wisconsin, Madison, Wisconsin (1909)
Lambda: Columbia University, New York, New York (1910)
Mu: University of Washington, Seattle, Washington (1912)
Nu: University of California at Berkeley, Berkeley, California (1913)
Xi: University of Nebraska, Lincoln, Nebraska (1913)
Omicron: University of Pennsylvania, Philadelphia, Pennsylvania (1914)
Pi: Pi - University of Colorado, Boulder, Colorado (1915)
Rho: University of Minnesota, Minneapolis, Minnesota (1916)
Sigma: University of Kentucky, Lexington, Kentucky (1917)
Tau: Stanford University, Stanford, California (1917)
Upsilon: Pennsylvania State University, University Park, Pennsylvania (1918)
Phi: Phi - Iowa State University, Ames, Iowa (1920)
Chi: University of Chicago, Chicago, Illinois (1920)
Psi: Oregon State University, Corvallis, Oregon (1920)

Omega chapter is reserved for deceased brethren.

Italic text denotes an inactive chapter.