What are the Hoover, South Dakota Zip Codes for 2020, 2019Primary Zip Codes for HooverZip CodePrimary CitySecondary City57760NewellHoover, Castle Rock, Cedar Canyon, Gill,Cities sharing Zip Codes with HooverZip CodePrimary CitySecondary CityMore Information57760NewellCastle Rock57760NewellCedar Canyon57760NewellGill57760NewellHooverAdvertisements