
Summerfield
- County:
- St. Clair County
- County Seat:
- No
- Area (mi²):
- 0.513
- State:
- Illinois
Summerfield is a village located in St. Clair County, Illinois. Summerfield has a 2025 population of 324. Summerfield is currently declining at a rate of -1.22% annually and its population has decreased by -5.54% since the most recent census, which recorded a population of 343 in 2020.
The average household income in Summerfield is $76,250 with a poverty rate of 16.48%. The median age in Summerfield is 45.8 years: 42.2 years for males, and 48.9 years for females.