3 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Gillette | 1 | 33,506 | 33,481 | 0.01% | 1,445 | 23.19 | City |
| Wright | 2 | 1,655 | 1,649 | 0.06% | 545 | 3.04 | Town |
| Sleepy Hollow | 3 | 1,410 | 1,187 | 0.43% | 3,389 | 0.42 | CDP |
Gillette is the largest city in Campbell County, with a population of 33,506.
Sleepy Hollow is the smallest city in Campbell County.
There are 3 cities in Campbell County, Wyoming.