Pennington County | |
|---|---|
 Pennington County Courthouse in Rapid City | |
 Location within the U.S. state of South Dakota | |
 South Dakota's location within the U.S. | |
| Coordinates: 44°01′N 102°49′W / 44.01°N 102.82°W | |
| Country |  United States |
| State |  South Dakota |
| Founded | 1875 (created) 1877 (organized) |
| Named for | John L. Pennington |
| Seat | Rapid City |
| Largest city | Rapid City |
| Area | |
| • Total | 2,784 sq mi (7,210 km2) |
| • Land | 2,777 sq mi (7,190 km2) |
| • Water | 7.8 sq mi (20 km2) 0.3% |
| Population (2020) | |
| • Total | 109,222 |
| • Estimate (2023) | 115,903  |
| • Density | 40/sq mi (20/km2) |
| Time zone | UTC−7 (Mountain) |
| • Summer (DST) | UTC−6 (MDT) |
| Congressional district | At-large |
| Website | pennco |
Pennington County is a county in the U.S. state of South Dakota. As of the 2020 census, the population was 109,222,[1] making it the second most populous county in South Dakota. Its county seat is Rapid City.[2] The county was created in 1875, and was organized in 1877.[3] It is named for John L. Pennington, fifth Governor of Dakota Territory, who held office in 1875 when the county was formed.[4]
Pennington County is included in the Rapid City metropolitan statistical area. It is also the location of Mount Rushmore.
- ^ "State & County QuickFacts". United States Census Bureau. Retrieved March 21, 2024.
- ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
- ^ "Dakota Territory, South Dakota, and North Dakota: Individual County Chronologies". Dakota Territory Atlas of Historical County Boundaries. The Newberry Library. 2006. Archived from the original on April 2, 2018. Retrieved March 31, 2015.
- ^ "Pennington County, SD History" Archived October 22, 2013, at the Wayback Machine. Pennington County official website. Retrieved January 8, 2011.