Their website shows that there are 12 NPC sororities at W&M:
Alpha Chi Omega
Alpha Kappa Alpha
Chi Omega
Delta Delta Delta
Delta Gamma
Delta Sigma Theta
Gamma Phi Beta
Kappa Alpha Theta
Kappa Delta
Kappa Kappa Gamma
Phi Mu
Pi Beta Phi
(from
http://www.wm.edu/so/greeks/chapters/ )
I also have an old friend who goes to William and Mary and I know she's greek (I think she's an AKA, but I could be wrong.) I'm seeing her next week, so I'll be sure to ask her about their greek life.