The value of all farms, ranches, and rural real estate for sale in Union County recently was nearly $20 million, representing a combined 1,859 acres of land for sale in Union County. Union County ranks 58th in the Cyclone State for the total acreage of land currently advertised for sale. Among cities in Union County with farms, ranches, hunting land and other land for sale, Creston featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Union County. Union County is Iowa's 91st largest county (425 square miles). It's located in the Western Iowa region of Iowa.