Union County is in Southern Illinois. Of the 102 counties in the Prairie State, 270,174-acre Union County ranks 71st by size. There is nearly 1,000 acres of farms for sale in Illinois's Union County based on recent Land Network data. The combined market value of farms, rural land, hunting land and other land for sale here is about $4 million. The average price of farmland for sale in Union County was $542,777. Farms for sale in Union County hold livestock including horses, cattle, goats, sheep and pig. Browse all Illinois farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or lifestyle needs.