Of 66 counties in the Mount Rushmore State, Pennington County ranks third in terms of size (2,784 square miles). Pennington County is in the Black Hills & Badlands South Dakota region. Recent Land Network data records approximately 1,000 acres of timberland for sale in South Dakota's Pennington County, which is valued at a combined $2 million. The average price of timberland for sale in Pennington County was $751,950. Browse all South Dakota forest and timberland for sale on the Land Network to find the right timberland acreage for your commercial or individual investment needs.