Berwick township
- County:
- Warren County
- County Seat:
- No
- Area (mi²):
- 35.807
- State:
- Illinois
Berwick township is located in Warren County, Illinois. Berwick township has a 2026 population of 296. Berwick township is currently declining at a rate of -0.34% annually and its population has decreased by -3.9% since the most recent census, which recorded a population of 308 in 2020.
The median household income in Berwick township is $69,861 with a poverty rate of 0%. The median age in Berwick township is 57.9 years: 60.7 years for males, and 57.3 years for females. For every 100 females there are 75.0 males.