Custer County is in Black Hills & Badlands South Dakota. Of the 66 counties in the state, Custer County ranks 16th in terms of size (1,559 square miles). Custer County, South Dakota, has almost 1,000 acres of commercial land and property for sale based on recent Land Network data. The combined market value of land for sale here was about $2 million. The average price of commercial acreage for sale in Custer County was $577,966. Browse all South Dakota commercial land and property for sale on the Land Network to find your next commercial property or land investment.