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Welcome to Allen Harbor Marine Service, a full-service, family-owned boatyard and marina located on beautiful Nantucket Sound. Well known for providing exceptional sales and service, we have been proudly serving Cape Cod boaters for over 90 years. Our Sales Department can help you find a boat best suited to your boating needs, or assist you with the sale of your current boat. Our Service Department provides year-round service performed by factory-trained, certified technicians and customer service oriented personnel to make your boating experience safe and enjoyable for the whole family.