Founded in 1875, Pennington County is one of 66 counties in the state of South Dakota. Historically, Pennington County was formed from unorganized territory. The city of Rapid City is the county seat. With FIPS code of 103, Pennington County has a population of 111,806 and area of 2,776 square miles (7,190 km2).
List of all cities in Pennington County, SD alphabetically
| City/Town | Postal Code | Area Code |
| Box Elder, SD | 57719 | 605 |
| Cactus Flats, SD | 57775 | 605 |
| Caputa, SD | 57725 | 605 |
| Conata, SD | 57780 | 605 |
| Cottonwood, SD | 57775 | 605 |
| Creighton, SD | 57790 | 605 |
| Deerfield, SD | 57745 | 605 |
| Dowling, SD | 57790 | 605 |
| Elm Springs, SD | 57791 | 605 |
| Farmingdale, SD | 57725 | 605 |
| Gumbo, SD | 57791 | 605 |
| Hill City, SD | 57745 | 605 |
| Hisega, SD | 57702 | 605 |
| Imlay, SD | 57780 | 605 |
| Jolly Acres, SD | 57701 | 605 |
| Keystone, SD | 57751 | 605 |
| Mystic, SD | 57745 | 605 |
| New Underwood, SD | 57761 | 605 |
| Old Town, SD | 57701 | 605 |
| Owanka, SD | 57767 | 605 |
| Pactola Lake, SD | 57702 | 605 |
| Quinn, SD | 57775 | 605 |
| Rapid City, SD | 57701 | 605 |
| 57702 | 605 | |
| 57703 | 605 | |
| 57709 | 605 | |
| Rochford, SD | 57745 | 605 |
| Rockerville, SD | 57701 | 605 |
| 57702 | 605 | |
| Scenic, SD | 57780 | 605 |
| Silver City, SD | 57702 | 605 |
| Viewfield, SD | 57761 | 605 |
| Wall, SD | 57790 | 605 |
| Wasta, SD | 57767 | 605 |
| 57791 | 605 | |
| Wicksville, SD | 57767 | 605 |