| Locality | Post Code |
|---|---|
| Alpine, Clark | 71921 |
| Amity, Clark | 71921 |
| Arkadelphia, Clark | 71923 |
| Beirne, Clark | 71721 |
| Caddo Valley, Clark | 71923 |
| Caney Valley, Clark | 71921 |
| Curtis, Clark | 71728 |
| Dalark, Clark | 71923 |
| Degray, Clark | 71923 |
| Elm, Clark | 71921 |
| Fendley, Clark | 71921 |
| Griffithtown, Clark | 71923 |
| Gum Springs, Clark | 71923 |
| Gurdon, Clark | 71743 |
| Hearn, Clark | 71923 |
| Hollywood, Clark | 71923 |
| Joan, Clark | 71923 |
| Okolona, Clark | 71962 |
| Point Cedar, Clark | 71921 |
| Richwood, Clark | 71923 |
| Rosboro, Clark | 71921 |
| West Gum Springs, Clark | 71923 |
| Whelen Springs, Clark | 71772 |
| Witherspoon, Clark | 71923 |