There are 26 cities in Pennington County, South Dakota.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Rapid City | 1 | 80,896 | 74,928 | 1.88% | 1,469 | 55.1 | City |
| Box Elder | 2 | 14,512 | 11,935 | 4.64% | 984 | 14.8 | City |
| Rapid Valley | 3 | 7,168 | 8,553 | -1.08% | 1,108 | 6.5 | CDP |
| Newcastle | 4 | 3,315 | 3,357 | -0.33% | 1,294 | 2.6 | City |
| Lead | 5 | 3,053 | 2,980 | 0.59% | 1,483 | 2.1 | City |
| Summerset | 6 | 3,007 | 2,978 | 0.23% | 1,104 | 2.7 | City |
| Blackhawk | 7 | 2,936 | 3,029 | 0.1% | 620 | 4.7 | CDP |
| Colonial Pine Hills | 8 | 2,322 | 2,720 | -0.51% | 152 | 15.3 | CDP |
| Custer | 9 | 1,822 | 1,910 | -1.19% | 735 | 2.5 | City |
| Green Valley | 10 | 1,424 | 1,252 | 2.59% | 371 | 3.8 | CDP |
| Deadwood | 11 | 1,406 | 1,153 | 4.69% | 285 | 4.9 | City |
| Ashland Heights | 12 | 1,292 | 1,082 | 3.11% | 444 | 2.9 | CDP |
| Piedmont | 13 | 1,006 | 1,041 | -0.89% | 643 | 1.6 | City |
| Hill City | 14 | 978 | 877 | 2.62% | 745 | 1.3 | City |
| Wonderland Homes | 15 | 911 | 1,070 | 7.68% | 3,844 | 0.2 | CDP |
| Wall | 16 | 684 | 698 | -0.58% | 260 | 2.6 | Town |
| Johnson Siding | 17 | 658 | 658 | 0% | 176 | 3.7 | CDP |
| New Underwood | 18 | 615 | 593 | 0.82% | 422 | 1.5 | City |
| Hermosa | 19 | 371 | 378 | -0.54% | 473 | 0.8 | Town |
| Keystone | 20 | 240 | 244 | -0.41% | 80 | 3.0 | Town |
| Hill View Heights | 21 | 225 | 65 | 1.81% | 103 | 2.2 | CDP |
| Interior | 22 | 65 | 67 | -1.52% | 49 | 1.3 | Town |
| Quinn | 23 | 64 | 63 | 0% | 53 | 1.2 | Town |
| Wasta | 24 | 61 | 63 | -1.61% | 318 | 0.2 | Town |
| Caputa | 25 | 34 | 0 | 9.68% | 116 | 0.3 | CDP |
| Cottonwood | 26 | 11 | 10 | 0% | 12 | 0.9 | Town |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Rapid City is the largest city in Pennington County.
Cottonwood is the smallest city in Pennington County.
There are 26 cities in Pennington County, South Dakota.