Niles
- County:
- Cook County
- County Seat:
- No
- Area (mi²):
- 5.848
- State:
- Illinois
Niles is a village located in Cook County, Illinois. Niles has a 2026 population of 29,918. Niles is currently growing at a rate of 0.6% annually but its population has decreased by -2.83% since the most recent census, which recorded a population of 30,789 in 2020.