Founded in 1830, Coles County is one of 102 counties in the state of Illinois. Historically, Coles County was formed from Clark and Edgar County. The city of Charleston is the county seat. With FIPS code of 29, Coles County has a population of 46,765 and area of 508 square miles (1,316 km2).
List of all cities in Coles County, IL alphabetically
| City/Town | Postal Code | Area Code |
| Ashmore, IL | 61912 | 217 |
| Charleston, IL | 61920 | 217 |
| Humboldt, IL | 61931 | 217 |
| Lerna, IL | 62440 | 217 |
| Mattoon, IL | 61938 | 217 |
| Oakland, IL | 61943 | 217 |
| Rardin, IL | 61920 | 217 |
| Trilla, IL | 62469 | 217 |