| Code | Name | Region |
|---|---|---|
| GBBMD | Borehamwood | HRT |
| GBBGN | Borough Green | KEN |
| GBBBR | Boroughbridge | NYK |
| GBSBS | Borrowstounness | FAL |
| GBBSS | Borrowstowness | CMA |
| GBBOT | Borth-y-gest | GWN |
| GBBLX | Bloxwich | WLL |
| GBUNH | Blunham | CBF |
| GBBLY | Blyth | NBL |
| GBYTH | Blyth | NTT |
| GBBYB | Blythe Bridge | STS |
| GBBY3 | Blyton | LIN |
| GBGAN | Boat Of Garten | HLD |
| GBBB2 | Bobbington | SHR |
| GBDMB | Boddam | ABD |
| GBBWY | Bodelwyddan | DEN |
| GBBFO | Bodffordd | AGY |
| GBBDM | Bodmin | CON |
| GBBD9 | Bodorgan | GWN |
| GBBSI | Bognor Regis | WSX |
| GBBDN | Boldon | STY |
| GBBOI | Bollington | CHE |
| GBWSX | Bolney | WSX |
| GBBSO | Bolsover | DBY |
| GBLTD | Bolt Head | |
| GBBLT | Bolton | BOL |
| GBBLW | Blackwood | CAY |
| GBBCW | Blackwood Hill | MON |
| GBEUF | Blaenau-ffestiniog | GWN |
| GBBVN | Blaenavon | TOF |
| GBYKJ | Blaina | BGW |
| GBZTH | Blair Atholl | PKN |
| GBZLD | Blairgowrie | PKN |
| GBBLJ | Blairmore | AGB |
| GBLKN | Blakeney | GLS |
| GBBLC | Blakeney | NFK |
| GBBLF | Blandford Forum | DOR |
| GBBFA | Blandford Saint Mary | DOR |
| GBBYR | Blantyre | SLK |
| GBBLD | Blaydon | GAT |
| GBBCG | Bletchingdon | OXF |
| GBBLN | Bletchingley | SRY |
| GBBLE | Bletchley | BKM |
| GBWJH | Blewbury | OXF |
| GBBDH | Blidworth | NTT |
| GBBKY | Blockley | GLS |
| GBBIO | Bitton | SGC |
| GBBY4 | Blaby | LEC |
| GBBPL | Black Pill | SWA |
| GBBCB | Blackboys | ESX |