Union County is in Western Iowa. Of the 99 counties in the Wrestling State, Union County is 91st in terms of its size (425 square miles). Recent listings of residential land and property for sale in Iowa's Union County totals nearly 1,000 acres and a combined market value of approximately $6 million. The most common type of land for sale by combined acreage in Union County is house. The average price of residential land for sale in Union County was $262,917. Browse all residential land and rural property for sale in Iowa to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.