There was a combined $4 million of farmsand rural real estate for sale in Union County, Indiana, recently on Land.com. The total acreage of all Union County farms, rural land, hunting land and other land for sale was almost 1,000 acres. Union County ranks 92nd in the state for the total acreage of land currently advertised for sale. Among cities in Union County with farms, rural land, hunting land and other land for sale, Liberty featured the most land for sale. Union County is Indiana's 90th biggest county (165 square miles). It's located in the East Indiana region of the state.