Gillette
- County:
- Campbell County
- County Seat:
- Yes
- Area (mi²):
- 23.189
- State:
- Wyoming
Gillette is a city located in Campbell County, Wyoming. Gillette has a 2026 population of 33,846. It is also the county seat of Campbell County. Gillette is currently growing at a rate of 0.96% annually and its population has increased by 1.05% since the most recent census, which recorded a population of 33,494 in 2020.