Lake County is in Southeast South Dakota. Of the 66 counties in the Mount Rushmore State, 368,103-acre Lake County ranks 54th by size. Recent listings of residential land and property for sale in South Dakota's Lake County totals almost 1,000 acres and a combined market value of roughly $10 million. The most common type of land for sale by combined acreage in Lake County is homesite. The average price of residential acreage for sale in Lake County was $675,520. 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.