I work in the Financial Aid office of a large university and there is only one other greek that I currently know of, an A Phi.
Honestly, I wish there were more...or that I knew of more. But I don't think that people are greek in my office, some have even kind of turned their noses up at me when they found out that I as greek..
Oh well, their loss if they don't want to make friends cause I'm greek!