Union County is in Western Iowa. Of the 99 counties in the Cyclone State, Union County ranks 91st in terms of size (272,510 acres). Iowa's Union County has approximately 1,000 acres of residential land for sale based on recent Land Network data. The combined market value of farms, ranches, hunting land and other land for sale here was roughly $8 million. The average price of residential acreage for sale in Union County was $272,935. 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.