I don't know of one resource for that info... your best bet would check at national web pages. Or contact the inter/national headquarters. I know TKE has a
ton of chapters, but not sure if they're the "largest" fraternity. You can also check Baird's Manual of American College Fratenities, but it will be a bit out of date (I think the last publication was 1991).
You'll have to do a bit of research to find all of the info.
------------------
SilverTurtle@greekchat.com
Phi Beta Fraternity
Phi chapter