Coldbrook township
- County:
- Warren County
- County Seat:
- No
- Area (mi²):
- 35.573
- State:
- Illinois
Coldbrook township is located in Warren County, Illinois. Coldbrook township has a 2026 population of 420. Coldbrook township is currently declining at a rate of -0.47% annually and its population has decreased by -3.89% since the most recent census, which recorded a population of 437 in 2020.
The median age in Coldbrook township is 62.9 years: 63.6 years for males, and 62.8 years for females. For every 100 females there are 91.7 males.