Land for sale in Union County, Iowa, recently totaled around $8 million and almost 1,000 acres. Union County ranks 55th out of 99 counties in the Wrestling State for the combined amount 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. From an economic perspective, manufacturing and related services are the main 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.