What are the Boothbay Harbor, Maine Zip Codes for 2020, 2019Primary Zip Codes for Boothbay HarborZip CodePrimary CitySecondary City04538Boothbay HarborBoothbay Harbor, Boothbay Hbr, Capitol Is, Capitol Island04570Squirrel IslandBoothbay Harbor, Boothbay Hbr, Squirrel Is,Cities sharing Zip Codes with Boothbay HarborZip CodePrimary CitySecondary CityMore Information04538Boothbay HarborBoothbay Hbr04538Boothbay HarborCapitol Is04538Boothbay HarborCapitol Island04570Squirrel IslandBoothbay Hbr04570Squirrel IslandSquirrel Is04570Squirrel IslandBoothbay Harbor Boothbay Harbor population stats Advertisements