nationals?

You'll find different opinions, but in general people tend to agree on the same few sororities as the strongest nationally. On our campus, those would be Chi O, Tri Delt, Pi Phi, and Kappa. These sororities have produced a number of successful women, raise a lot of money for their respective philanthropies, and have a lot of successful chapters in a variety of places. Other sororities tend to be strong in different regions. The traditionally strong Southern sororities that we have are ADPi, Zeta, KD, Phi Mu, and Alpha Chi (to a lesser extent- they're strong in the south but aren't considered a "powerhouse" like the others). As for the others, APhi is strong in the West, especially California, and Sigma is stronger at smaller schools (as a former education sorority, they started at smaller schools and that's where they've historically thrived) and is also strong in Missouri. Take all this with a grain of salt though, these are just my own impressions that I've formed from being in a sorority and coming from a family of sorority women. Everyone will have their own opinion.

At UNC we have practically all the big sororities around the nation (minus DG, DZ, and Theta...I might be missing a few others). Chi Omega, Kappa, and Tridelt are probably the largest across the nation. After that probably ZTA, Pi Phi, KD, Alpha Phi, ADPi, and AXO.

KKG, Tridelt, XO, ZTA, Pi Phi, and Alpha Phi are probably the most spread out and tend to be strong up north, out west, and in places in the south. KD, ADPi, and AXO tend to be much stronger in the south, although you'll find these chapters scattered across the nation too.

The only sororities that are less dominant nationally are Phi Mu (they tend to only be strong in the south, but I've heard they're VERY popular at southern schools) and Tri Sigma. Tri Sigma is the only sorority that I'd consider even remotely small nationally, but they're still fairly big compared to some other sororities around the nation. If you've ever heard of Alpha Xi Delta, I'd compare them to each other in terms of size nationally. We don't really have any obscure sororities at UNC. You can join almost any of them and run into plenty of alumnae/active members from all over the country. Hope this helped!

SigEp is pretty strong. Cleaned up the mess here.

National rankings don't matter. Sorority life is for four years in college to add to your campus experience and make life long friends. If you are one of those misguided girls who thinks that your national affiliation will make or break you after college in your career or social life you are going to be disappointed. Your sorority could be the best thing that ever happened to you but only if you join based on sisterhood and not some calculated stepping stone for connections. Your affiliation will not matter after you graduate to give you some kind of insider advantage. Love your sisters and get the most out of your four years, then graduate and move on.