| Code | Name | Region |
|---|---|---|
| GBBAL | Baldock | HRT |
| GBBLO | Balerno | EDH |
| GBBFN | Balfron | STG |
| GBBLI | Balintore | HLD |
| GBBCU | Ballachulish | HLD |
| GBBNR | Ballantrae | SAY |
| GBBAX | Ballater | ABD |
| GBBXM | Ballinamallard | FER |
| GBDAC | Ballindalloch | MRY |
| GBLHC | Ballindalloch | SCB |
| GBBIN | Ballingry | FIF |
| GBBYP | Ballintoy | ANT |
| GBBKO | Bally Kelly | CCG |
| GBBYC | Ballycastle | ANT |
| GBBAE | Ballyclare | ANT |
| GBDOR | Ballydorn | DOW |
| GBAYM | Aymestrey | HEF |
| GBAY9 | Aynho | OXF |
| GBAYR | Ayr | SAY |
| GBACB | Back | ELS |
| GBBKC | Backaland, Eday | ORK |
| GBBAP | Bacup | LAN |
| GBSGC | Badminton | SGC |
| GBBGL | Bagillt | FLN |
| GBBAG | Baginton | WAR |
| GBAGA | Baglan | NTL |
| GBBGS | Bagshot | SRY |
| GBAGE | Bagstone | SGC |
| GBBWZ | Bagworth | LEC |
| GBBAI | Baildon | BRD |
| GBION | Baile Mor, Iona | AGB |
| GBBTI | Bailleston | GLG |
| GBBKW | Bakewell | DBY |
| GBBAA | Bala | GWN |
| GBLPR | Balbeggie | PKN |
| GBBBN | Balbriggan | |
| GBWAD | Audlem | CHE |
| GBZAA | Augher | |
| GBAKV | Aughnacloy | DGN |
| GBAUL | Aultbea | HLD |
| GBAUS | Austrey | WAR |
| GBAP3 | Authorpe | LIN |
| GBAVE | Aveley | ESS |
| GBAIE | Aviemore | HLD |
| GBAVC | Avoch | HLD |
| GBAVO | Avonmouth | BST |
| GBAXB | Axbridge | SOM |
| GBAXM | Axminster | |
| GBAXO | Axmouth | DEV |
| GBAYF | Aycliffe | DUR |