Information on GNC in Riverdale, MD 20737 Outlet Note Regular Brands GNC Maryland Riverdale 329479 Rating 4.7 based on 97 votes Address 6130 Baltimore Avenue Riverdale, MD 20737 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 - Aspen Hill GNC Outlet - Andrews Afb GNC Outlet - Annapolis GNC Outlet - Annapolis People Also Viewed