Union County is in Southern Illinois. Of the 102 counties in the Inland Empire, Union County is 71st in terms of its size (422 square miles). Union County, Illinois, has about 1,000 acres of undeveloped land for sale based on recent Land Network data. The combined market value of farms and rural land for sale here was around $600,000. The average price of undeveloped land for sale in Union County was $96,016. 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, dove and ducks. 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.