What are the Yankton, South Dakota Zip Codes for 2020, 2019Primary Zip Codes for YanktonZip CodePrimary CitySecondary City57078Yankton57079YanktonGurneys Seed & Nursery CoCities sharing Zip Codes with YanktonZip CodePrimary CitySecondary CityMore Information57079YanktonGurneys Seed Nursery CoAdvertisements