| Locality | Post Code |
|---|---|
| Big Pool, Washington | 21711 |
| Big Spring, Washington | 21722 |
| Boonsboro, Washington | 21713 |
| Brownsville, Washington | 21715 |
| Cascade, Washington | 21719 |
| Cavetown, Washington | 21720 |
| Chewsville, Washington | 21721 |
| Clear Spring, Washington | 21722 |
| Fairplay, Washington | 21733 |
| Fort Ritchie, Washington | 21719 |
| Funkstown, Washington | 21734 |
| Gapland, Washington | 21779 |
| Hagerstown, Washington | 21740, 21742 |
| Hancock, Washington | 21750 |
| Highfield, Washington | 21719 |
| Keedysville, Washington | 21756 |
| Maugansville, Washington | 21767 |
| Northern, Washington | 21742 |
| Rohrersville, Washington | 21779 |
| Saint James, Washington | 21733, 21781 |
| Sharpsburg, Washington | 21782 |
| Smithsburg, Washington | 21783 |
| St James, Washington | 21733 |
| Williamsport, Washington | 21795 |