Cities in State of Illinois, United States ( 474 )
- Chicago Ridge
- Chillicothe, Illinois
- Cicero, Illinois
- Clarendon Hills
- Clinton, Illinois
- Coal City, Illinois
- Coal Valley, Illinois
- Collinsville, Illinois
- Colona, Illinois
- Columbia, Illinois
- Cortland, Illinois
- Country Club Hills, Illinois
- Countryside, Illinois
- Crest Hill
- Crestwood, Illinois
- Crete, Illinois
- Creve Coeur, Illinois
- Crystal Lake, Illinois
- Danville, Illinois
- Darien, Illinois
- Decatur, Illinois
- Deer Park, Illinois
- Deer Park, Illinois
- Deerfield, Illinois
- DeKalb, Illinois
- Des Plaines
- Diamond, Illinois
- Dixmoor
- Dixon, Illinois
- Dolton, Illinois
- Downers Grove
- Du Quoin
- Dupo
- Dwight, Illinois
- East Alton
- East Dundee, Illinois