Fayetteville
- County:
- St. Clair County
- County Seat:
- No
- Area (mi²):
- 0.296
- State:
- Illinois
Fayetteville is a village located in St. Clair County, Illinois. Fayetteville has a 2026 population of 286. Fayetteville is currently declining at a rate of -0.69% annually and its population has decreased by -2.72% since the most recent census, which recorded a population of 294 in 2020.
The median household income in Fayetteville is $59,583 with a poverty rate of 15.21%. The median age in Fayetteville is 33.1 years: 32.7 years for males, and 34 years for females. For every 100 females there are 84.0 males.