Mosinee
- County:
- Marathon County
- County Seat:
- No
- Area (mi²):
- 7.855
- State:
- Wisconsin
Mosinee is a city located in Marathon County, Wisconsin. Mosinee has a 2026 population of 4,531. Mosinee is currently declining at a rate of -0.02% annually but its population has increased by 1.61% since the most recent census, which recorded a population of 4,459 in 2020.