Hamlin County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the Mount Rushmore State, Hamlin County is 57th in terms of its size (538 square miles). Recent listings of residential land for sale in South Dakota's Hamlin County totals approximately 1,000 acres and a combined market value of almost $3 million. By overall acreage, house is the most common type of land for sale in Hamlin County. The average price of residential acreage for sale in Hamlin County was $367,437. The economy here is largely 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.