Pennington County located in Western South Dakota, has a population of around 100,948. It encompasses around 2,784 square miles with 8 miles being water. Rapid City, South Dakota second most populated city is located in Pennington county. Pennington County is considered the central part of the Black Hills region. Pennington County has a very rich history. Mount Rushmore one of the most popular tourist attractions in the world is located in Pennington County, South Dakota. There is nothing even comparable to this spectacular site. Pennington county is a very large county that encompasses nearly 3,000 acres; Included in these acres is Badlands National Park, another fantastic place to see in the area. You will find numerous other attractions in this county that are one of a kind ! Please share a interesting fact or something you love about Pennington County.