Yankton County is in Southeast South Dakota. Of the 66 counties in the Mount Rushmore State, 532-square-mile Yankton County ranks 59th by size. The total value of approximately 1,000 acres of residential land recently listed for sale in Yankton County, South Dakota, was $8 million. The average price of residential land for sale in Yankton County was $534,071. Browse all residential land and rural property for sale in South Dakota to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.