Arlington Heights
- County:
- Cook County
- County Seat:
- No
- Area (mi²):
- 16.613
- State:
- Illinois
Arlington Heights is a village located in Cook County, Illinois. Arlington Heights has a 2026 population of 75,596. Arlington Heights is currently growing at a rate of 0.71% annually but its population has decreased by -2.33% since the most recent census, which recorded a population of 77,399 in 2020.