What are the Mason, South Dakota Zip Codes for 2020, 2019Primary Zip Codes for MasonZip CodePrimary CitySecondary City57717Belle FourcheMason, Willet, FruitdaleCities sharing Zip Codes with MasonZip CodePrimary CitySecondary CityMore Information57717Belle FourcheFruitdale57717Belle FourcheMason57717Belle FourcheWilletAdvertisements