Exchanges
| Code | Name |
|---|---|
| SSAHY | Ashbury |
| EMASHBB | Ashby De La Zouch |
| WWASHC | Ashcott |
| EAASD | Ashdon |
| CMASHF | Ashfield |
| LWASH | Ashford |
| NDASF | Ashford |
| NEAT | Ashington |
| SDSHNGT | Ashington (South Downs) |
| ESASH | Ashkirk |
| WNASH | Ashley |
| SLASH | Ashover |
| WWASHR | Ashreigney |
| LSASH | Ashtead |
| LCAIM | Ashton In Makerfield |
| LCAOR | Ashton On Ribble |
| WMAUH | Ashton-Under-Hill |
| MRASH | Ashton-Under-Lyne |
| STASHST | Ashurst |
| WWASHW | Ashwater |
| SMAW | Ashwell |
| EAASW | Ashwicken |
| SLASK | Askern |
| LCASP | Aspatria |
| LCASL | Aspull |
| NSASS | Assynt |
| SMATL | Asthall Leigh |
| LCASB | Astley Bridge |
| WMASN | Aston |
| SMAN | Aston Clinton |
| SLASC | Aston Common |
| CMASTX | Aston Cross |
| WMAST | Astwood Bank |
| ESATH | Athelstaneford |
| EMATTHE | Atherstone |
| LCATH | Atherton |
| SLAC | Attercliffe |
| EAATT | Attleborough |
| ESACB | Auchenblae |
| WSAUC | Auchencairn |
| ESACG | Auchengray |
| WSAUG | Auchenmalg |
| NSALR | Auchleuchries |
| NSANG | Auchnagatt |
| ESARR | Auchterarder |
| ESARH | Auchterhouse |
| NSATL | Auchterless |
| ESARY | Auchtermuchty |
| WMADM | Audlem |
| WMADY | Audley |