The value of farms, ranches, hunting land and other land for sale in Monona County recently on Land.com was $4 million. This represents 1,000 acres of farms, ranches, hunting land and other land for sale in Monona County. Monona County ranks 94th out of 99 counties in the Cyclone State for the combined amount of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Monona County, Onawa had the most land for sale. Monona County has a large agricultural economy, with 538 farms recorded in the county during the latest U.S. Census. Farming activities in Monona County generate annual revenues of $23 million, most of which is from crops. Monona County is the 16th largest county (698 square miles) in Iowa. It's located in the Western Iowa region of the state.