Brookings County is in Glacial Lakes & Prairies South Dakota. Of the 66 counties in the state, 804-square-mile Brookings County ranks 41st by size. A recent survey of Land Network data includes nearly 1,000 acres of residential land and property for sale in South Dakota's Brookings County, which is valued at a combined $1 million. The average price of residential acreage for sale in Brookings County was $339,850. 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.