Towns
| State | City/Town | Town Title |
|---|---|---|
| Illinois | Cuba | Cuba, IL |
| Illinois | Cullom | Cullom, IL |
| Illinois | Cutler | Cutler, IL |
| Illinois | Cypress | Cypress, IL |
| Illinois | Dahinda | Dahinda, IL |
| Illinois | Dahlgren | Dahlgren, IL |
| Illinois | Dakota | Dakota, IL |
| Illinois | Dale | Dale, IL |
| Illinois | Dallas City | Dallas City, IL |
| Illinois | Dalton City | Dalton City, IL |
| Illinois | Dalzell | Dalzell, IL |
| Illinois | Dana | Dana, IL |
| Illinois | Danforth | Danforth, IL |
| Illinois | Danvers | Danvers, IL |
| Illinois | Danville | Danville, IL |
| Illinois | Darien | Darien, IL |
| Illinois | Darmstadt | Darmstadt, IL |
| Illinois | Davis | Davis, IL |
| Illinois | Davis Junction | Davis Junction, IL |
| Illinois | Dawson | Dawson, IL |
| Illinois | De Land | De Land, IL |
| Illinois | De Soto | De Soto, IL |
| Illinois | Decatur | Decatur, IL |
| Illinois | Deer Creek | Deer Creek, IL |
| Illinois | Deer Grove | Deer Grove, IL |