| Locality | Post Code |
|---|---|
| Bowes | DL12 |
| Bradbury | TS21 |
| Brancepeth | DH7 |
| Brandon | DH7 |
| Brandon Village | DH7 |
| Brasside | DH1 |
| Bridgehill | DH8 |
| Brignall | DL12 |
| Broompark | DH7 |
| Brotherlee | DL13 1SR |
| Browney | DH7 |
| Brusselton | DL4 1PZ, DL4 1QA |
| Burnhope | DH7 |
| Burnopfield | NE16 |
| Butterknowle | DL13 |
| Byers Green | DL16 |
| Carrville | DH1 |
| Cassop | DH6 |
| Castle Dene | DH3 |
| Castle Eden | TS27 |
| Castleside | DH8 |
| Catchgate | DH9 |
| Chester Le Street | DH2, DH3 |
| Chester Moor | DH2, DH3 |
| Chilton | DL17 |
| Chilton Industrial Estate | DL17 |