[ebdelt]

Well while I'm late to the party I figured I'd add in my two cents.

ADPi, AOPi, KD, Phi Mu, and Zeta are sororities I would consider "Southern" due to the fact that while they are all strong organizations, their "best" and most historic chapters all seem to lie in the South.

Other sororities such as Tri Delta, Chi O, Kappa, Theta, DG, and Pi Phi all have some very strong chapters within the south but are not as regional in their strength and have a more national repuation, but not saying those sororities are necessarily better.

As for fraternities, which I haven't really seen discussed in this thread, I think there isn't as much of distinction. KA is the only fraternity I can think of that is known for being a "Southern" fraternity. You could probably claim SAE as southern since it was founded at Alabama and is the only Antebellum South-founded IFC fraternity. There are several other fraternities that have strong chapters at several Southern universities, but the fraternities' national reputation is not in anyway strictly linked to the South, such as KA.