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 | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Rapid City | 1 | South Dakota | 82,724 | 74,924 | 2.41% | 1,502 | 55.07 |
| Box Elder | 2 | South Dakota | 13,225 | 11,937 | 2.5% | 896 | 14.75 |
| Rapid Valley | 3 | South Dakota | 6,222 | 8,553 | -8.13% | 962 | 6.47 |
| Newcastle | 4 | Wyoming | 3,395 | 3,357 | 0.29% | 1,326 | 2.56 |
| Summerset | 5 | South Dakota | 3,128 | 2,978 | 1.23% | 1,149 | 2.72 |
| Lead | 6 | South Dakota | 3,048 | 2,978 | 0.59% | 1,481 | 2.06 |
| Blackhawk | 7 | South Dakota | 2,831 | 3,029 | -1.7% | 598 | 4.74 |
| Colonial Pine Hills | 8 | South Dakota | 2,188 | 2,720 | -3.48% | 143 | 15.29 |
| Custer | 9 | South Dakota | 1,889 | 1,911 | -0.26% | 762 | 2.48 |
| Green Valley | 10 | South Dakota | 1,454 | 1,252 | 3.64% | 379 | 3.84 |
| Ashland Heights | 11 | South Dakota | 1,348 | 1,082 | 5.23% | 463 | 2.91 |
| Deadwood | 12 | South Dakota | 1,338 | 1,152 | 3.64% | 271 | 4.93 |
| Hill City | 13 | South Dakota | 1,038 | 880 | 4.01% | 791 | 1.31 |
| Piedmont | 14 | South Dakota | 1,027 | 1,045 | -0.39% | 657 | 1.56 |
| Wonderland Homes | 15 | South Dakota | 865 | 1,070 | 5.1% | 3,650 | 0.24 |
| Wall | 16 | South Dakota | 692 | 698 | -0.14% | 263 | 2.63 |
| Johnson Siding | 17 | South Dakota | 658 | 658 | 0% | 176 | 3.73 |
| New Underwood | 18 | South Dakota | 632 | 598 | 1.44% | 433 | 1.46 |
| Hermosa | 19 | South Dakota | 380 | 380 | 0% | 485 | 0.78 |
| Hill View Heights | 20 | Wyoming | 313 | 65 | 18.11% | 143 | 2.19 |
| Keystone | 21 | South Dakota | 242 | 242 | 0% | 81 | 3 |
| Interior | 22 | South Dakota | 67 | 67 | 0% | 50 | 1.34 |
| Quinn | 23 | South Dakota | 66 | 62 | 1.54% | 55 | 1.20 |
| Wasta | 24 | South Dakota | 64 | 64 | 0% | 333 | 0.19 |
| Caputa | 25 | South Dakota | 21 | 0 | -16% | 72 | 0.29 |
| Cottonwood | 26 | South Dakota | 12 | 10 | 9.09% | 13 | 0.92 |
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.