Beloit College:
Beta in 1860 and they were continious until 1988.
But then Phi Psi was founded in 1881 (closed from 71-77, but active again)when then then spawned Sig Chi (or so the story goes they purged a inner 'socieity') and Sig Chi chartered in 1882 and has continued until the present day.
Sororities are much more complicated.
Theta Pi Gamma (local) was founded, underground, in 1896, but then became DG from 22-62 when they reverted to Theta Pi again. They closed for a couple of years, and then reactivated.
NPC wise...Pi Phi cam in 1919 then quickly followed by KD in 1920, both groups left in 1970.
this is the webpage with the info, its interesting. ie. Sigma Pi was local, went Sigma Pi, then reverted to a co-ed before closing.
http://www.beloit.edu/~libhome/Archi...oit/greek.html