| Code | Name | Region |
|---|---|---|
| GBBWQ | Bow | DEV |
| GBOWS | Bow Street | CGN |
| GBBWN | Bowburn | DUR |
| GBBWE | Bowden | SCB |
| GBOWD | Bowdon | TRF |
| GBBWG | Bowers Gifford | |
| GBBOW | Bowling | RFW |
| GBBWP | Bowthorpe | NFK |
| GBBOX | Box | WIL |
| GBBXO | Boxford | SFK |
| GBBXD | Boxted | ESS |
| GBRCD | Bracadale | HLD |
| GBBCK | Brackley | NTH |
| GBBMI | Brackmills | NTH |
| GBBKN | Bracknell | BRC |
| GBZRC | Bracora | HLD |
| GBBSC | Boscastle | CON |
| GBBOD | Boscombe | DOR |
| GBOHM | Bosham | WSX |
| GBBSL | Bosley | CHE |
| GBBOS | Boston | LIN |
| GBBS2 | Boston Spa | LDS |
| GBBWL | Bothwell | SLK |
| GBBOL | Botley | BKM |
| GBBOY | Botley | HAM |
| GBBTY | Botley | OXF |
| GBZTT | Bottesford | LEC |
| GBBHO | Boughton | NFK |
| GBGBO | Boughton | NTT |
| GBBMX | Boulmer | |
| GBBOM | Boultham | LIN |
| GBBUR | Bourne | LIN |
| GBYEB | Bourne End | BKM |
| GBBOH | Bournemouth | DOR |
| GBBVE | Bournville/birmingham | BIR |
| GBBSM | Bourton | NSM |
| GBBNS | Bolton Le Sands | LAN |
| GBZAD | Boncath | PEM |
| GBBON | Bo'ness | FAL |
| GBOGA | Boningale | SHR |
| GBBNY | Bonnybridge | FAL |
| GBBOG | Bonnyrigg | MLN |
| GBBTU | Bontddu | GWN |
| GBBOO | Bootle | CMA |
| GBBOE | Bootle | SFT |
| GBBOR | Borden | KEN |
| GBBEG | Bordesley Green | BIR |
| GBODN | Bordon | HAM |
| GBBDC | Bordon Camp | CAM |
| GBOAM | Boreham | ESS |