The University of Tennessee Knoxville has 19 sororities, but at the time of my enrollment (in 94) - they had 20 (AGD went inactive). So currently our Panhellenic represents all 19 sororities:
Alpha Chi Omega
Alpha Delta Pi
Alpha Kappa Alpha
Alpha Omicron Pi
Alpha Xi Delta
Chi Omega
Delta Delta Delta
Delta Gamma
Delta Sigma Theta
Delta Zeta
Kappa Delta
Kappa Kappa Gamma
Lambda Theta Alpha
Phi Mu
Pi Beta Phi
Sigma Gamma Rho
Sigma Kappa
Zeta Phi Beta
Zeta Tau Alpha
What is kinda cool - I think we have the same number of fraternities on campus as well