Prospect Heights
- County:
- Cook County
- County Seat:
- No
- Area (mi²):
- 4.207
- State:
- Illinois
Prospect Heights is a city located in Cook County, Illinois. Prospect Heights has a 2026 population of 15,566. Prospect Heights is currently growing at a rate of 0.69% annually but its population has decreased by -2.66% since the most recent census, which recorded a population of 15,991 in 2020.