| Locality | Post Code |
|---|---|
| Allendale Cottages | NE17 7RF |
| Annfield Plain | DH9 |
| Auckland Park | DL14 |
| Aycliffe | DL5 |
| Aycliffe Business Park | DL5 |
| Aykley Heads | DH1 |
| Baldersdale | DL12 |
| Barnard Castle | DL12 |
| Barningham | DL11 |
| Beamish | DH9 |
| Bearpark | DH7 |
| Belmont | DH1 |
| Belmont Industrial Estate | DH1 |
| Billy Row | DL15 |
| Binchester | DL14 |
| Binchester Moor | DL16 |
| Bishop Auckland | DL14 |
| Bishop Middleham | DL17 |
| Blackhall Colliery | TS27 |
| Blackhall Rocks | TS27 4DG |
| Blackhill | DH8 |
| Blanchland | DH8 |
| Bolam | DL2 |
| Boldron | DL12 |
| Bournmoor | DH4 |
| Bowburn | DH6 |