
Fairmont City
- County:
- Madison County
- County Seat:
- No
- Area (mi²):
- 6.205
- State:
- Illinois
Fairmont City is a village located in Madison County, Illinois. Fairmont City has a 2025 population of 2,120. Fairmont City is currently declining at a rate of -1.26% annually and its population has decreased by -5.99% since the most recent census, which recorded a population of 2,255 in 2020.
The average household income in Fairmont City is $56,554 with a poverty rate of 27.64%. The median age in Fairmont City is 40.9 years: 43.3 years for males, and 40.4 years for females.