They have a couple different options for housing too. Some sororities have dorms that they rent out and some have mini-apartment type buildings. There are 8 or 9 NPC groups of varying sizes. If you look on their Panhellenic website, you can look at a grade report and see sizes of chapters there too.
http://greeks.wmich.edu/
ETA: I swear I saw a male asking about recruitment here too but I can't find the thread now. If he happens upon this one, he should check out this website
http://greeks.wmich.edu/recruitment.html