There was a total of $4 million of farms and rural land for sale in Union County recently on Land.com. The total of all Union County farms and rural real estate for sale was nearly 1,000 acres. Union County ranks 90th out of 92 counties in the Hoosier?State for the total number of acres of land currently advertised for sale. Of all locations in Union County with farms, hunting land and other rural land and acreage for sale, Liberty featured the most land for sale. Union County is the 90th largest county (165 square miles) in Indiana. It's located in the East Indiana region of the state.