Of 66 counties in the Mount Rushmore State, Perkins County is second in terms of its size (2,889 square miles). Perkins County is in Black Hills & Badlands South Dakota. South Dakota's Perkins County has about 1,000 acres of undeveloped land for sale based on recent Land Network data. The combined market value of ranches, farms, hunting land and other rural land and acreage for sale here was around $800,000. Browse all Perkins County undeveloped land for sale on the Land Network to find your next commercial property or land investment. The most common type of land for sale by combined acreage in Perkins County is ranches.