A total of nearly 3,000 acres were listed for sale in Union County recently, representing a combined approximately $20 million in Union County farms and ranches for sale. Union County ranks 73rd in the state for the combined amount of land currently advertised for sale. Among cities in Union County with farms, ranches, and rural real estate for sale, 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.