The value of ranches, farms, hunting land and other rural land and acreage for sale in Union County, Iowa, recently on Land.com was around $9 million. This represents around 1,000 acres of ranches, farms, hunting land and other rural land and acreage for sale in Union County. Union County ranks 54th out of 99 counties in the Hawkeye State for the total acreage of land currently advertised for sale. There were four properties listed as sold in Union County through the Land Network Comparable Sales Program. This represented a total value of $3,218,600. Creston had the most land for sale. Manufacturing and related services are the largest economic sectors in Union County. Union County is Iowa's 91st biggest county (425 square miles). It's located in the Western Iowa region of Iowa.