Fall River County is in Black Hills & Badlands South Dakota. Of the 66 counties in the Coyote State, 1,749-square-mile Fall River County ranks 12th by size. South Dakota's Fall River County has roughly 1,000 acres of ranches for sale based on recent Land Network data. The combined market value of land and rural real estate for sale here was nearly $6 million. The average price of ranches for sale in Fall River County was $2 million. Browse all South Dakota ranches for sale on the Land Network to find the ranch that's right for your business or commercial needs, from the sprawling legacy ranch to unbelievable residential ranch for your second home, investment property or retirement nest egg.