Memphis is essentially the only city where University of Memphis grads settle.
They have about the smallest radius of alums I've ever seen. If you were to map their alums and compare it to maps of other universities, I believe they would have the heaviest concentration to one point. To them, Desoto, Fayette, and Tipton County is expanding their horizons.
I'd be curious to know, but I really don't think Memphis has an alumni association outside of the city of Memphis.