Obrien County is in Western Iowa. Of the 99 counties in the Cyclone State, Obrien County ranks 46th in terms of size (573 square miles). Recent listings of residential land and property for sale in Obrien County, Iowa, totals nearly 1,000 acres and a combined market value of roughly $10 million. The most common type of land for sale by combined acreage in Obrien County is house. The average price of residential land for sale in Obrien County was $339,213. The economy here is mainly agricultural. Browse all residential land and rural property for sale in Iowa to find residential land and properties that suit your lifestyle needs, from existing residential homes and estates to land ready for future residential-property development.