The value of land and rural real estate for sale in Obrien County recently on Land.com was almost $11 million. This represents around 1,000 acres of farms, ranches, hunting land and other land for sale in Obrien County. Obrien County ranks 64th in the state for the total number of acres of land currently advertised for sale. Sheldon featured the most land for sale. Agriculture and farming drives the Obrien County economy, with 884 farms recorded in the county during the U.S. Census in 2012. Farming activities in Obrien County generate annual revenues of $14 million, the majority of which comes from livestock products. Obrien County is Iowa's 46th largest county (573 square miles). It's located in the Western Iowa region of the state.