Exchanges
| Code | Name |
|---|---|
| LVALL | Allerton (Lv) |
| CMALL | Allesley |
| EMALLES | Allestree Park |
| NDALL | Allhallows |
| ESALL | Alloa |
| LCALL | Allonby |
| WSALL | Alloway |
| ESALM | Almondbank |
| SSALM | Almondsbury |
| NSANS | Alness |
| NEAL | Alnmouth |
| NEAW | Alnwick |
| STALSFD | Alresford |
| EMALREW | Alrewas |
| WMALS | Alsager |
| NEALS | Alston |
| EMALSTO | Alstonfield |
| NSALT | Altnaharra |
| THATN | Alton |
| MRALT | Altrincham |
| ESALV | Alva |
| EMALVAS | Alvaston |
| NSALV | Alves |
| ESALY | Alyth |
| EMAMBER | Ambergate |
| SSAMB | Amberley |
| NEAM | Amble |
| LCAMB | Ambleside |
| SMAM | Amersham |
| STAMSBY | Amesbury |
| WSAMI | Amisfield |
| WNAML | Amlwch |
| SWAVY | Amman Valley |
| SWADW | Ammanford |
| MYAMP | Ampleforth |
| SMAP | Ampthill |
| ESAMU | Amulree |
| EMANCAS | Ancaster |
| NEAC | Ancroft |
| ESANC | Ancrum |
| STANDVR | Andover |
| SSAFD | Andoversford |
| LVANF | Anfield |
| SWAGL | Angle |
| NIAE | Annaghmore |
| NIAA | Annalong |
| WSANN | Annan |
| WSANK | Annbank |
| WWANST | Anstey Mills |
| ESANS | Anstruther |