| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Clennell | NE65 7BG |
| Postal/ZIP Codes in Clifton | NE61 |
| Postal/ZIP Codes in Coanwood | NE49 |
| Postal/ZIP Codes in Collingwood Manor | NE61 |
| Postal/ZIP Codes in Colwell | NE46, NE48 |
| Postal/ZIP Codes in Coquet Enterprise Park | NE65 0PE |
| Postal/ZIP Codes in Corbridge | NE45 |
| Postal/ZIP Codes in Cornhill-on-Tweed | TD12 |
| Postal/ZIP Codes in Cottier Grange | NE42 |
| Postal/ZIP Codes in Cragside | NE65 |
| Postal/ZIP Codes in Cramlington | NE23 |
| Postal/ZIP Codes in Craster | NE66 |
| Postal/ZIP Codes in Cresswell | NE61 |
| Postal/ZIP Codes in Crookham | TD12 |
| Postal/ZIP Codes in Dalton | NE18 |
| Postal/ZIP Codes in Denwick | NE66 |
| Postal/ZIP Codes in Detchant | NE70 |
| Postal/ZIP Codes in Deuchar Park | NE61 |
| Postal/ZIP Codes in Dissington | NE18 |
| Postal/ZIP Codes in Doddington | NE71 |
| Postal/ZIP Codes in Donaldsons Lodge | TD12 4XN |
| Postal/ZIP Codes in Donkleywood | NE48 |
| Postal/ZIP Codes in Doxford | NE67 |
| Postal/ZIP Codes in Druridge Bay | NE61 5EG |
| Postal/ZIP Codes in Duddo | TD15 2PS |
| Postal/ZIP Codes in Dunstan | NE66 |