Land for sale in Sweetwater County recently totaled around $19 million and 1,000 acres. Sweetwater County ranks 17th in the Equality State for the total number of acres of land currently advertised for sale. Of all locations in Sweetwater County with ranches, farms, hunting land and other rural land and acreage for sale, Rock Springs featured the most land for sale. Economically speaking, Sweetwater County's is largely dependent on mining and mineral extraction-related businesses and services. Sweetwater County is the largest county in Wyoming (10,491 square miles). It's located in the Southwest Wyoming region of the state.