| Locality | Post Code |
|---|---|
| Merrian, Northumberland | 17851 |
| Mile Hill, Northumberland | 17801 |
| Mile Run, Northumberland | 17801 |
| Milton, Northumberland | 17847 |
| Montandon, Northumberland | 17850 |
| Mount Carmel, Northumberland | 17851 |
| Mt Carmel, Northumberland | 17851 |
| Natalie, Northumberland | 17851 |
| Northumberland, Northumberland | 17857 |
| Oak Park, Northumberland | 17857 |
| Oaklyn, Northumberland | 17801 |
| Paxinos, Northumberland | 17860 |
| Pitman, Northumberland | 17964 |
| Potts Grove, Northumberland | 17865 |
| Ralpho, Northumberland | 17872 |
| Ranshaw, Northumberland | 17866 |
| Rebuck, Northumberland | 17867 |
| Red Cross, Northumberland | 17823 |
| Reed Station, Northumberland | 17860 |
| Reeders Grove, Northumberland | 17824 |
| Riverside, Northumberland | 17868 |
| Rockefeller, Northumberland | 17801 |
| Sagon, Northumberland | 17872 |
| Schuyler, Northumberland | 17772 |
| Sevenpoints, Northumberland | 17801 |
| Shamokin, Northumberland | 17872 |