Towns
| State | City/Town | Town Title |
|---|---|---|
| Ohio | Custar | Custar, OH |
| Ohio | Cutler | Cutler, OH |
| Ohio | Cuyahoga Falls | Cuyahoga Falls, OH |
| Ohio | Cygnet | Cygnet, OH |
| Ohio | Cynthiana | Cynthiana, OH |
| Ohio | Dalton | Dalton, OH |
| Ohio | Damascus | Damascus, OH |
| Ohio | Danville | Danville, OH |
| Ohio | Dayton | Dayton, OH |
| Ohio | De Graff | De Graff, OH |
| Ohio | Decatur | Decatur, OH |
| Ohio | Deerfield | Deerfield, OH |
| Ohio | Deersville | Deersville, OH |
| Ohio | Defiance | Defiance, OH |
| Ohio | Delaware | Delaware, OH |
| Ohio | Dellroy | Dellroy, OH |
| Ohio | Delphos | Delphos, OH |
| Ohio | Delta | Delta, OH |
| Ohio | Dennison | Dennison, OH |
| Ohio | Derby | Derby, OH |
| Ohio | Derwent | Derwent, OH |
| Ohio | Deshler | Deshler, OH |
| Ohio | Dexter City | Dexter City, OH |
| Ohio | Diamond | Diamond, OH |
| Ohio | Dillonvale | Dillonvale, OH |