Berlin
- County:
- Green Lake County
- County Seat:
- No
- Area (mi²):
- 5.918
- State:
- Wisconsin
Berlin is a city located in Green Lake County, Wisconsin. Berlin has a 2026 population of 5,607. Berlin is currently declining at a rate of -0.73% annually but its population has increased by 0.57% since the most recent census, which recorded a population of 5,575 in 2020.