Roberts County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Coyote State, Roberts County is 27th in terms of its size (1,135 square miles). The total value of approximately 1,000 acres of residential land recently listed for sale in South Dakota's Roberts County was nearly $5 million. The average price of residential acreage for sale in Roberts County was $486,536. The economy here is mainly agricultural. 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.