| Locality | Post Code |
|---|---|
| Albright, Clark | 62441 |
| Casey, Clark | 62420 |
| Clark, Clark | 62441 |
| Clarksville, Clark | 62441 |
| Cleone, Clark | 62442 |
| Dennison, Clark | 62423 |
| Marshall, Clark | 62441 |
| Martinsville, Clark | 62442 |
| Moonshine, Clark | 62442 |
| Neadmore, Clark | 62442 |
| Oliver, Clark | 62441 |
| Parker, Clark | 62474 |
| West Union, Clark | 62477 |
| Westfield, Clark | 62474 |