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