Custer County is in Black Hills & Badlands South Dakota. Of the 66 counties in the Mount Rushmore State, Custer County is 16th in terms of its size (1,559 square miles). There is about 1,000 acres of farms for sale in Custer County, South Dakota, based on recent Land Network data. The combined market value of land and rural real estate for sale here is around $8 million. The average price of farmland for sale in Custer County was $2 million. Farms for sale in Custer County feature livestock including cattle and horses. Browse all South Dakota farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future commercial or individual needs.