The value of all farms, ranches, hunting land and other land for sale in South Dakota's Walworth County recently was almost $7 million, representing a total of 1,585 acres of land for sale in Walworth County. Walworth County ranks 40th in the Coyote State for the total number of acres of land currently advertised for sale. Of all land and rural real estate for sale in Walworth County, Selby featured the most land for sale. Walworth County is South Dakota's 45th largest county (744 square miles). It's located in the Great Lakes South Dakota region of the state.