Marquette University (WI) has greeks - I not exactly sure which ones, though (AXiD, Triangle, and a bunch of others)
Loyola University (Chicago) has some as well - Kappa Beta Gamma, and I'm also not sure the others
University of Detroit Mercy - Kappa Beta Gamma, Gamma Phi Beta, Kappa Delta (?), Sigma Pi, and others which I'm also not sure of off the top of my head.
St Louis University may also have a greek system
Actually, most (but not all) of the Catholic Universities in the US are Jesuit (though some are Dominican, Franciscan, and Norbertine). The best bet would be to check a school's about page and then go to student life. There are a lot of schools out there. . .
Sarah
St. Norbert College
University of Wisconsin - Stevens Point
Eastern Michigan University
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