Union County is in Western Iowa. Of the 99 counties in the state, 425-square-mile Union County ranks 91st by size. A recent survey of Land Network data totals roughly 1,000 acres of residential land for sale in Iowa's Union County, which is valued at a combined $4 million. The average price of residential acreage for sale in Union County was $227,388. 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.