There was a combined $10 million of farms, ranches, and rural real estate for sale in Obrien County, Iowa, recently on Land.com. The total size of all Obrien County land and rural real estate for sale was approximately 1,000 acres. Obrien County ranks 73rd out of 99 counties in the Hawkeye State for the total number of acres of land currently advertised for sale. Of all farms, ranches, hunting land and other land for sale in Obrien County, 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.