AL postcode area
The AL area holds 10 districts and 7,792 live postcodes; its largest place is St Albans.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| AL1 | 1,217 | St Albans |
| AL2 | 737 | London Colney |
| AL3 | 955 | Bernards Heath |
| AL4 | 787 | Wheathampstead |
| AL5 | 1,058 | Harpenden |
| AL6 | 506 | Welwyn |
| AL7 | 895 | — |
| AL8 | 422 | Welwyn Garden City |
| AL9 | 429 | Brookmans Park |
| AL10 | 786 | Hatfield |
Contains OS data © Crown copyright and database right 2026. Contains Royal Mail data © Royal Mail copyright and database right 2026. Source: Office for National Statistics licensed under the Open Government Licence v3.0. Postcode data is the ONS Postcode Directory, August 2026 edition; counts are live postcodes with a usable location. Northern Ireland postcodes carry a separate licence and are not included; Scotland joins when the site's Scottish coverage does.