Fall River County is in Black Hills & Badlands South Dakota. Of the 66 counties in the Mount Rushmore State, Fall River County ranks 12th in terms of size (1 million acres). Fall River County, South Dakota, includes approximately 1,000 acres of residential land for sale based on recent Land Network data. The combined market value of farms, ranches, hunting land and other land for sale here was almost $25 million. The average price of residential acreage for sale in Fall River County was $416,710. 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.