Pennington County, South Dakota
| Pennington County, South Dakota | |
|---|---|
 Location in the U.S. state of South Dakota |
|
 South Dakota's location in the U.S. |
|
| Founded | 1877 |
| Named for | John L. Pennington |
| Seat | Rapid City |
| Largest city | Rapid City |
| Area | |
| • Total | 2,784 sq mi (7,211 km2) |
| • Land | 2,777 sq mi (7,192 km2) |
| • Water | 7.7 sq mi (20 km2), 0.3% |
| Population (est.) | |
| • (2015) | 108,702 |
| • Density | 36/sq mi (14/km²) |
| Congressional district | At-large |
| Time zone | Mountain: UTC-7/-6 |
| Website | www |
Pennington County is a county located in the U.S. state of South Dakota. As of the 2010 census, the population was 100,948, making it the second-most populous county in South Dakota. Its county seat is Rapid City. The county was created in 1875 and organized in 1877. It is named for John L. Pennington, fifth Governor of Dakota Territory, who held office in 1875 when the county was formed.
Pennington County is included in the Rapid City, SD Metropolitan Statistical Area. It is also the location of the Mount Rushmore National Memorial.
According to the U.S. Census Bureau, the county has a total area of 2,784 square miles (7,210 km2), of which 2,777 square miles (7,190 km2) is land and 7.7 square miles (20 km2) (0.3%) is water. It is the third-largest county in South Dakota by area. Mount Rushmore National Memorial lies in the county. Black Elk Peak, South Dakota's highest mountain, is located in the county. At 7,242 feet (2,208 m) it is the highest natural point between the Rocky Mountains and the French Alps. Part of Badlands National Park lies within the county. The park also extends into neighboring Oglala Lakota and Jackson counties.
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