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