
Fayetteville township
- County:
- St. Clair County
- County Seat:
- No
- Area (mi²):
- 42.962
- State:
- Illinois
Fayetteville township is located in St. Clair County, Illinois. Fayetteville township has a 2025 population of 1,443. Fayetteville township is currently declining at a rate of -1.23% annually and its population has decreased by -5.38% since the most recent census, which recorded a population of 1,525 in 2020.
The average household income in Fayetteville township is $98,406 with a poverty rate of 5.68%. The median age in Fayetteville township is 41.4 years: 50.2 years for males, and 36.5 years for females.