Sororities for adults

[FuzzieAlum]

Not that we aren't adults here in the NPC, but I don't know what else to call orgs like Tri-Kappa and Beta Sigma Phi.

How many sororities are there for adult women, and where are they prevalent?

Beta Sigma Phi seems to be the biggest and nationwide. Tri-Kappa is Indiana-only. I can't remember the names of any more ... but I know they are more. Are they most prevalent in one part of the country? Because out here (West Coast) I've never heard of any except Beta Sigma Phi.

Is there any website that provides a comprehensive list of these orgs? Do they have an umbrella org? Does membership in one conflict with membership in an NPC/NPHC/NALFO org?

I realize these are a lot of questions ... if anyone can direct me to more info I'd appreciate it! (I'm not looking for membership myself, if anyone is wondering.)