A total of around 1,000 acres were listed for sale in South Dakota's Walworth County recently; the combined value of all Walworth County farms and ranches for sale was around $2 million. Walworth County ranks 43rd in the Mount Rushmore State for the total number of acres of land currently advertised for sale. Of all farms, ranches, and rural real estate for sale in Walworth County, Selby had the most land for sale. Walworth County is the 45th biggest county (744 square miles) in South Dakota. It's located in the Great Lakes South Dakota region of South Dakota.