The combined value of land for sale in Calhoun County recently on Land.com was $6 million. This represents 1,000 acres of land and rural real estate for sale in Calhoun County. Calhoun County ranks 81st out of 99 counties in Iowa for the combined amount of land currently advertised for sale. Manson featured the most land for sale. Calhoun County has a large agricultural economy, with 826 farms recorded in the county during the latest U.S. Census. Farming activities in Calhoun County generate annual revenues of $30 million, most of which is from crops. Calhoun County is the 52nd largest county (572 square miles) in Iowa. It's located in the Western Iowa region of the state.