WD postcode area
The WD area holds 12 districts and 7,404 live postcodes; its largest place is Watford.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| WD3 | 1,280 | Rickmansworth |
| WD4 | 373 | Kings Langley |
| WD5 | 261 | Abbots Langley |
| WD6 | 1,075 | Borehamwood |
| WD7 | 428 | Radlett |
| WD17 | 572 | Watford |
| WD18 | 714 | West Watford |
| WD19 | 693 | Carpenders Park |
| WD23 | 769 | Bushey |
| WD24 | 531 | North Watford |
| WD25 | 687 | Leavesden Green |
| WD99 | 21 | — |
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.