Information on GNC in Manassas, VA 20110 Outlet Note Regular Brands GNC Virginia Manassas 328091 Rating 4.7 based on 97 votes Address 9199 Prescott Avenue Manassas, VA 20110 Phone Hours may vary in different stores. For accurate hours, please contact each store directly. Suite643 Hours may vary in different stores. For accurate hours, please contact each store directly. Nearby GNC Outlet GNC Outlet - Burke GNC Outlet - Chantilly GNC Outlet - Annadale GNC Outlet - Aldie People Also Viewed