Union County is in Southern Illinois. Of the 102 counties in the Land of Lincoln, Union County is 71st in terms of its size (422 square miles). The total value of around 1,000 acres of undeveloped land recently listed for sale in Union County, Illinois, was $800,000. The average price of undeveloped land for sale in Union County was $119,350. Some suggested uses for undeveloped land currently for sale in Union County include for hunting/fishing, commercial, 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 hunting/fishing, commercial and agriculture use. Browse all Illinois undeveloped acreage for sale on the Land Network to find your next commercial property or land investment.