Oldest local sororities that have remained local

[Xidelt]

Case Western has Sigma Psi, a local sorority that is over 100 years old.

[ihearttrisigma]

Ursinus College - Collegeville, PA

Sororities (all use greek letters)
-Phi Alpha Psi 1907
-Tau Sigma Gamma 1929
-Alpha Sigma Nu 1926
-Omega Chi 1934
-Kappa Delta Kappa 1938
-Upsilon Phi Delta 1993

Fraternities (all use greek letters)
-Alpha Phi Epsilon 1869
-Beta Sigma Lambda 1926
-Sigma Rho Lambda 1928
-Pi Omega Delta 1978
-Delta Pi Sigma 1949

[Benzgirl]

Originally Posted by Xidelt

Case Western has Sigma Psi, a local sorority that is over 100 years old.

Yep. Sigma Psi, Founding Date: March 7, 1897