The value of all farms, ranches, hunting land and other land for sale in Union County, Iowa, recently was approximately $19 million, representing a combined 1,814 acres of land for sale in Union County. Union County ranks 61st in the Wrestling State for the total number of acres of land currently advertised for sale. Of all land for sale in Union County, 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 the state.