Obrien County is in Western Iowa. Of the 99 counties in the Hawkeye State, 573-square-mile Obrien County ranks 46th by size. Recent listings of residential land for sale in Obrien County, Iowa, totals 1,000 acres and a combined market value of approximately $11 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 $369,479. The county has a rural, farm-based economy. 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.