What are the Double Island, North Carolina Zip Codes for 2020, 2019Primary Zip Codes for Double IslandZip CodePrimary CitySecondary City28740Green MountainDouble Island, Green Mt, Greenmountain, Grn Mountain, Lower Pig Pen, Pleasant Gap, Relief, Upper Pig Pen, Green MtnCities sharing Zip Codes with Double IslandZip CodePrimary CitySecondary CityMore Information28740Green MountainGreen Mtn28740Green MountainDouble Island28740Green MountainGreen Mt28740Green MountainGreenmountain28740Green MountainGrn Mountain28740Green MountainLower Pig Pen28740Green MountainPleasant Gap28740Green MountainRelief28740Green MountainUpper Pig PenAdvertisements