Prospect Harbor, Maine Prospect Harbor, Maine Prospect Harbor, Maine is positioned in Maine Prospect Harbor, Maine - Prospect Harbor, Maine Prospect Harbor is an unincorporated improve in Hancock County, Maine, United States. Its ZIP code is 04669. Municipalities and communities of Hancock County, Maine, United States Amherst Aurora Bar Harbor Blue Hill Brooklin Brooksville Bucksport Castine Cranberry Isles Dedham Deer Isle Eastbrook Franklin Frenchboro Gouldsboro Great Pond Hancock Lamoine Mariaville Mount Desert Orland Osborn Otis Penobscot Sedgwick Sorrento Southwest Harbor Stonington Sullivan Surry Swan's Island Tremont Trenton Verona Island Waltham Winter Harbor Bar Harbor Blue Hill Bucksport Castine Southwest Harbor Winter Harbor Bass Harbor Bernard Birch Harbor Corea East Blue Hill East Orland Harborside Hulls Cove Islesford Manset Minturn Northeast Harbor Prospect Harbor Salsbury Cove Sargentville Seal Cove Seal Harbor Sunset