| Code | Name | Region |
|---|---|---|
| GBAHV | Ash Vale | SRY |
| GBAHP | Ashampstead | WBK |
| GBABK | Ashbocking | SFK |
| GBASH | Ashbourne | DBY |
| GBABU | Ashburton | DEV |
| GBADZ | Ashby De La Zouch | LEC |
| GBACU | Ashchurch | GLS |
| GBAS6 | Ashcott | SOM |
| GBAHL | Asheldham | ESS |
| GBASD | Ashford | KEN |
| GBASF | Ashford | SRY |
| GBAST | Ashington | NBL |
| GBAHG | Ashington | SOM |
| GBAGR | Ashley | CAM |
| GBHA2 | Ashley | HAM |
| GBAS9 | Ashley | STS |
| GBGYL | Argyll | |
| GBAGO | Arinagour | AGB |
| GBARG | Arisaig | HLD |
| GBAHO | Arkholme | LAN |
| GBASY | Arlesey | CBF |
| GBAEY | Arley | WAR |
| GBALI | Arlington | GLS |
| GBARE | Armadale | WLN |
| GBAMD | Armadale, Isle Of Skye | HLD |
| GBARM | Armagh | ARM |
| GBANH | Arminghall | NFK |
| GBARI | Armitage | STS |
| GBATP | Armthorpe | DNC |
| GBARN | Arnesby | LEC |
| GBRAA | Arnish | HLD |
| GBARO | Arnold | NTT |
| GBNAR | Arran | NAY |
| GBARR | Arrington | CAM |
| GBAOH | Arrochar | AGB |
| GBATG | Arthog | GWN |
| GBAOE | Arboe (ardboe) | CKT |
| GBARB | Arbroath | ANS |
| GBDBG | Ardbeg | |
| GBAET | Ardentinny | AGB |
| GBARS | Ardersier | HLD |
| GBADF | Ardfern | AGB |
| GBAGL | Ardglass | DOW |
| GBAGU | Ardgour | HLD |
| GBADK | Ardkeen | DOW |
| GBRDY | Ardley | OXF |
| GBAMH | Ardmaleish | AGB |
| GBGIG | Ardminish, Gigha Island | AGB |
| GBAGW | Ardnagowan | AGB |
| GBAMN | Ardnamurchan | HLD |