Union County is in Western Iowa. Of the 99 counties in the Hawkeye State, Union County ranks 91st in terms of size (425 square miles). Recent listings of residential land and property for sale in Iowa's Union County totals around 1,000 acres and a combined market value of $4 million. The most common type of land for sale by combined acreage in Union County is residential property. The average price of residential acreage for sale in Union County was $217,193. 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.