Located in Tallgrass Prairie Kansas, 1,184-square-mile Sumner County is one of the ten biggest counties in the Jayhawk State. Kansas's Sumner County has nearly 1,000 acres of residential land and property for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was roughly $9 million. The average price of residential acreage for sale in Sumner County was $360,650. 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.