Towns
| State | City/Town | Town Title |
|---|---|---|
| Illinois | Colp | Colp, IL |
| Illinois | Columbia | Columbia, IL |
| Illinois | Colusa | Colusa, IL |
| Illinois | Compton | Compton, IL |
| Illinois | Concord | Concord, IL |
| Illinois | Congerville | Congerville, IL |
| Illinois | Cooksville | Cooksville, IL |
| Illinois | Cordova | Cordova, IL |
| Illinois | Cornell | Cornell, IL |
| Illinois | Cornland | Cornland, IL |
| Illinois | Cortland | Cortland, IL |
| Illinois | Cottage Hills | Cottage Hills, IL |
| Illinois | Coulterville | Coulterville, IL |
| Illinois | Country Club Hills | Country Club Hills, IL |
| Illinois | Countryside | Countryside, IL |
| Illinois | Cowden | Cowden, IL |
| Illinois | Creal Springs | Creal Springs, IL |
| Illinois | Crescent City | Crescent City, IL |
| Illinois | Crest Hill | Crest Hill, IL |
| Illinois | Creston | Creston, IL |
| Illinois | Crete | Crete, IL |
| Illinois | Creve Coeur | Creve Coeur, IL |
| Illinois | Cropsey | Cropsey, IL |
| Illinois | Crossville | Crossville, IL |
| Illinois | Crystal Lake | Crystal Lake, IL |