BB - Blackburn
The postal area BB (Blackburn) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within BB - Blackburn
| Country | Post Town | Postal District |
| England | Blackburn | BB1 BB2 |
| Darwen | BB3 | |
| Rossendale | BB4 | |
| Accrington | BB5 | |
| Blackburn | BB6 | |
| Clitheroe | BB7 | |
| Colne | BB8 | |
| Nelson | BB9 | |
| Burnley | BB10 BB11 BB12 |
|
| Barnoldswick | BB18 |
