The Massanutten Military Academy is located in Woodstock, as is the national headquarters of Sigma Sigma Sigma sorority.
Sigma Chi | Sigma Xi | Sigma Alpha Epsilon | Delta Sigma Theta | Phi Beta Sigma | Sigma Corporation | Sigma Alpha Mu | Sigma Phi Epsilon | Sigma | Kappa Sigma | Beta Gamma Sigma | Tau Beta Sigma | Six Sigma | Sigma Alpha Iota | Phi Sigma Kappa | SK Sigma Olomouc | Sigma SD14 | Sigma Gamma Rho | Phi Sigma Epsilon | Delta Sigma Pi | Sigma Tau Gamma | Sigma Sigma Sigma | Sigma Nu | Sigma Kappa | Phi Kappa Sigma | Lean Six Sigma | Beta Sigma Phi | Alpha Sigma Phi | Alpha Chi Sigma | Team IG-Sigma Sport |
The Ursinus College Greek community consists of six sororities, including Kappa Delta Kappa, Phi Alpha Psi, Sigma Sigma Sigma, Tau Sigma Gamma, Upsilon Phi Delta, and Omega Chi, and eight fraternities, including Alpha Phi Epsilon, Beta Sigma Lambda, Delta Pi Sigma, Kappa Alpha Psi, Phi Kappa Sigma, Pi Omega Delta, Sigma Pi and Sigma Rho Lambda.