UB postcode area
The UB area holds 12 districts and 7,216 live postcodes; its largest place is Hayes.
| District | Live postcodes | Largest place with its centre there |
|---|---|---|
| UB1 | 615 | Southall |
| UB2 | 532 | — |
| UB3 | 987 | Hayes |
| UB4 | 704 | — |
| UB5 | 840 | Northolt |
| UB6 | 860 | Greenford |
| UB7 | 632 | West Drayton |
| UB8 | 825 | Uxbridge |
| UB9 | 431 | Harefield |
| UB10 | 712 | Ickenham |
| UB11 | 19 | — |
| UB18 | 59 | — |
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.