| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Cowley | UB8 |
| Postal/ZIP Codes in Eastcote | HA5 |
| Postal/ZIP Codes in Harefield | UB9 |
| Postal/ZIP Codes in Harlington | UB3 |
| Postal/ZIP Codes in Harmondsworth | UB7 |
| Postal/ZIP Codes in Hayes | UB3, UB4 |
| Postal/ZIP Codes in Heathrow | TW6 |
| Postal/ZIP Codes in Hillingdon | UB10 |
| Postal/ZIP Codes in Ickenham | UB10 |
| Postal/ZIP Codes in London Heathrow Airport | TW6 |
| Postal/ZIP Codes in Northwood | HA6 |
| Postal/ZIP Codes in Ruislip | HA4 |
| Postal/ZIP Codes in Sipson | UB7 |
| Postal/ZIP Codes in South Ruislip | HA4 |
| Postal/ZIP Codes in Stockley Park | UB11 |
| Postal/ZIP Codes in Uxbridge | UB10, UB11, UB8, UB9 |
| Postal/ZIP Codes in West Drayton | UB7 |
| Postal/ZIP Codes in Yiewsley | UB7 |