A total of almost 1,000 acres were listed for sale in South Dakota's Walworth County recently; the combined value of all Walworth County farms, ranches, hunting land and other land for sale was approximately $5 million. Walworth County ranks 42nd in South Dakota for the combined amount of land currently advertised for sale. Selby featured the most land for sale. Walworth County is South Dakota's 45th biggest county (744 square miles). It's located in the Great Lakes South Dakota region of the state.