Williamson County is in Southern Illinois. Of the 102 counties in the Prairie State, Williamson County is 65th in terms of its size (444 square miles). A recent survey of Land Network data records about 1,000 acres of undeveloped land for sale in Illinois's Williamson County, which is valued at a combined $12 million. The average price of undeveloped acreage for sale in Williamson County was $427,493. Some suggested uses for undeveloped land currently for sale in Williamson County include for commercial, hunting/fishing, and agriculture use. Some common wildlife species to be found on undeveloped land for sale in Williamson County include whitetail deer, turkey, deer, ducks, dove, quail and waterfowl. Current commercial applications for commercial property for sale in Williamson County include for commercial, hunting/fishing and agriculture use. Browse all Illinois undeveloped acreage for sale on the Land Network to find your next commercial property or land investment.