Charleston
- County:
- Coles County
- County Seat:
- Yes
- Area (mi²):
- 9.077
- State:
- Illinois
Charleston is a city located in Coles County, Illinois. Charleston has a 2026 population of 17,361. It is also the county seat of Coles County. Charleston is currently declining at a rate of -0.28% annually and its population has decreased by -1.24% since the most recent census, which recorded a population of 17,579 in 2020.