3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gillette | 1 | 33,934 | 33,494 | 0.26% | 1,463 | 23 | City |
| Wright | 2 | 1,663 | 1,648 | 0.18% | 547 | 3 | Town |
| Sleepy Hollow | 3 | 1,410 | 1,187 | 0.43% | 3,389 | 0 | CDP |
Gillette is the largest city in Campbell County, with a population of 33,934.
Sleepy Hollow is the smallest city in Campbell County, with a population of 1,410.
There are 3 cities in Campbell County, Wyoming.