Custer County is in Black Hills & Badlands South Dakota. Of the 66 counties in the Coyote State, Custer County ranks 16th in terms of size (1,559 square miles). There is 1,000 acres of ranches for sale in Custer County, South Dakota, based on recent Land Network data. The combined market value of land for sale here is $2 million. The average price of ranches for sale in Custer County was $633,000. 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.