Mellette County is in Black Hills & Badlands South Dakota. Of the 66 counties in the Coyote State, 1,310-square-mile Mellette County ranks 21st by size. Recent listings of residential land and property for sale in Mellette County, South Dakota, totals 1,000 acres and a combined market value of roughly $1 million. The most common type of land for sale by combined acreage in Mellette County is homesite. The average price of residential land for sale in Mellette County was $105,538. The economy here is largely agricultural. Browse all residential land and rural property for sale in South Dakota 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.