What are the Castle Rock, South Dakota Zip Codes for 2020, 2019Primary Zip Codes for Castle RockZip CodePrimary CitySecondary City57760NewellCastle Rock, Cedar Canyon, Gill, HooverCities sharing Zip Codes with Castle RockZip CodePrimary CitySecondary CityMore Information57760NewellCastle Rock57760NewellCedar Canyon57760NewellGill57760NewellHooverAdvertisements