| Locality | Post Code |
|---|---|
| Allenport, Washington | 15412 |
| Amity, Washington | 15311 |
| Atlasburg, Washington | 15004 |
| Avella, Washington | 15312 |
| Beallsville, Washington | 15313 |
| Bentleyville, Washington | 15314 |
| Brownsville, Washington | 15417 |
| Bulger, Washington | 15019 |
| Burgettstown, Washington | 15021 |
| California, Washington | 15419 |
| Canonsburg, Washington | 15317 |
| Cecil, Washington | 15321 |
| Charleroi, Washington | 15022 |
| Clarksville, Washington | 15322 |
| Claysville, Washington | 15323 |
| Clinton, Washington | 15026 |
| Coal Center, Washington | 15423 |
| Cokeburg, Washington | 15324 |
| Courtney, Washington | 15067 |
| Daisytown, Washington | 15427 |
| Denbo, Washington | 15429 |
| Donora, Washington | 15033 |
| Dunlevy, Washington | 15432 |
| Eighty Four, Washington | 15330 |
| Elco, Washington | 15434 |
| Eldersville, Washington | 15021 |