Northbrook
- County:
- Cook County
- County Seat:
- No
- Area (mi²):
- 13.243
- State:
- Illinois
Northbrook is a village located in Cook County, Illinois. Northbrook has a 2026 population of 34,546. Northbrook is currently growing at a rate of 0.74% annually but its population has decreased by -1.72% since the most recent census, which recorded a population of 35,152 in 2020.