BL postcode area
The BL area holds 12 districts and 10,408 live postcodes; its largest place is Bolton.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| BL0 | 564 | Rossendale |
| BL1 | 1,852 | Bolton |
| BL2 | 1,152 | — |
| BL3 | 1,387 | Little Lever |
| BL4 | 850 | Farnworth |
| BL5 | 706 | Westhoughton |
| BL6 | 1,019 | Horwich |
| BL7 | 508 | Edgworth |
| BL8 | 1,009 | Tottington |
| BL9 | 1,333 | Bury |
| BL11 | 23 | — |
| BL78 | 5 | — |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.