What are the Westport Island, Maine Zip Codes for 2020, 2019Primary Zip Codes for Westport IslandZip CodePrimary CitySecondary City04578WiscassetWestport Island, Westport Is,Cities sharing Zip Codes with Westport IslandZip CodePrimary CitySecondary CityMore Information04578WiscassetWestport Is04578WiscassetWestport IslandAdvertisements