What are the Gretna, South Dakota Zip Codes for 2020, 2019Primary Zip Codes for GretnaZip CodePrimary CitySecondary City57471RoscoeGretna, Glen, LoyaltonCities sharing Zip Codes with GretnaZip CodePrimary CitySecondary CityMore Information57471RoscoeGlen57471RoscoeGretna57471RoscoeLoyaltonAdvertisements