Fairview Heights
- County:
- St. Clair County
- County Seat:
- No
- Area (mi²):
- 11.431
- State:
- Illinois
Fairview Heights is a city located in St. Clair County, Illinois. Fairview Heights has a 2026 population of 16,115. Fairview Heights is currently declining at a rate of -0.42% annually and its population has decreased by -3.31% since the most recent census, which recorded a population of 16,666 in 2020.