Information on GNC in Williamsport, PA 17701 Outlet Note Regular Brands GNC Pennsylvania Williamsport 330663 Rating 4.7 based on 97 votes Address 14 Fifth Street Williamsport, PA 17701 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 - Berwick GNC Outlet - Bellefonte GNC Outlet - Ashland GNC Outlet - Allentown People Also Viewed