Of 66 counties in the Mount Rushmore State, Custer County is 16th in terms of its size (1,559 square miles). Custer County is in Black Hills & Badlands South Dakota. South Dakota's Custer County includes almost 1,000 acres of riverfront 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 about $3 million. Browse all waterfront property for sale in Custer County on the Land Network to find the marina, lakefront and other recreational property that meets your needs, from waterside land perfect as a retirement investment to existing residential waterfront land and property for hunting, fishing and other outdoor-recreation pursuits! The most common type of land for sale by combined acreage in Custer County is residential property.