Ottawa County is in Tallgrass Prairie Kansas. Of the 105 counties in the Sunflower State, 721-square-mile Ottawa County ranks 58th by size. Recent Land Network data totals 1,000 acres of residential land and property for sale in Kansas's Ottawa County, which is valued at a combined $1 million. The average price of residential acreage for sale in Ottawa County was $275,000. The county has a rural, farm-based economy. Browse all residential land and rural property for sale in Kansas 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.