my Farmville Four girlfriend is right.
We did have many chapters at larger schools but this was when we were non-NPC. When we went NPC, lots of the women had to surrender their memberships in ASA which needless to say was detrimental to those chapters. It's very odd to see obits for Bucknell alumnae and see "she was a member of Phi Mu and Alpha Sigma Alpha." There are still quite a few chapters of ASA at larger schools...Penn State and Delaware among them. I know Tri-Sigma is at Pitt and UVA.
Alpha Sigma Tau is the other surviving member of the Association of Education Sororities. This all applies to them too.