Williamson County is in Southern Illinois. Of the 102 counties in the Land of Lincoln, 284,385-acre Williamson County ranks 65th by size. There is 1,000 acres of undeveloped land for sale in Williamson County, Illinois, based on recent Land Network data, making it the most common type of land for sale in Williamson County. The combined market value of farms, hunting land and other rural land and acreage for sale here is roughly $24 million. The average price of undeveloped acreage for sale in Williamson County was $410,690. 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, dove and ducks. Current commercial applications for commercial property for sale in Williamson County include for commercial, hunting/fishing and agriculture use. Browse all Illinois undeveloped land for sale on the Land Network to find your next commercial property or land investment.