
Illinois City
- County:
- Rock Island County
- County Seat:
- No
- Area (mi²):
- 0.457
- State:
- Illinois
Illinois City is a CDP located in Rock Island County, Illinois. Illinois City has a 2025 population of 46. Illinois City is currently growing at a rate of 6.98% annually but its population has decreased by -20.69% since the most recent census, which recorded a population of 58 in 2020.
The average household income in Illinois City is -$1000.00 Mn with a poverty rate of 0%. The median age in Illinois City is 0 years: 0 years for males, and 0 years for females.