Hamilton Nissan | New Nissan & Used Cars Dealer in Hagerstown, MD, Visit Hamilton Nissan for a variety of new and used cars for sale by Nissan. We have a service center, body shop, parts store and finance team. You can buy your new Nissan vehicle 100% online, in the comforts of your home with free home delivery! Nissan dealership in Hagerstown serving Waynesboro, Frederick, Martinsburg and Chambersburg.