Roberts County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Mount Rushmore State, Roberts County ranks 27th in terms of size (1,135 square miles). Recent listings of residential land and property for sale in South Dakota's Roberts County totals about 1,000 acres and a combined market value of approximately $4 million. The most common type of land for sale by combined acreage in Roberts County is homesite. The average price of residential land for sale in Roberts County was $394,050. The county has a rural, farm-based economy. 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.