Brillion
- County:
- Calumet County
- County Seat:
- No
- Area (mi²):
- 3.09
- State:
- Wisconsin
Brillion is a city located in Calumet County, Wisconsin. Brillion has a 2026 population of 3,318. Brillion is currently growing at a rate of 0.36% annually and its population has increased by 1% since the most recent census, which recorded a population of 3,285 in 2020.