Union County is in Southern Illinois. Of the 102 counties in the Prairie State, 422-square-mile Union County ranks 71st by size. The total value of about 1,000 acres of undeveloped land recently listed for sale in Union County, Illinois, was approximately $200,000. The average price of undeveloped acreage for sale in Union County was $55,000. Some suggested uses for undeveloped land currently for sale in Union County include for commercial, hunting/fishing, and agriculture use. Some common wildlife species to be found on undeveloped land for sale in Union County include whitetail deer, turkey, deer, ducks, waterfowl and dove. Current commercial applications for commercial property for sale in Union 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.