| District | Post Town | Coverage | Postcodes |
|---|---|---|---|
| UB1 | Southall | Southall | 602 |
| UB2 | Southall | Southall | 529 |
| UB3 | Southall, Hayes | Hayes, Harlington | 983 |
| UB4 | Hayes | Yeading, Hayes | 700 |
| UB5 | Northolt, Greenford | Northolt | 832 |
| UB6 | Greenford | Greenford, Perivale | 868 |
| UB7 | West Drayton | West Drayton, Harmondsworth, Sipson, Yiewsley, Longford | 635 |
| UB8 | West Drayton, Uxbridge | Uxbridge, Cowley, Hillingdon | 850 |
| UB9 | Uxbridge | Denham, Harefield | 432 |
| UB10 | Uxbridge | Hillingdon, Ickenham | 711 |
| UB11 | Uxbridge | Stockley Park | 20 |
| UB18 | Greenford | Non-geographic | 59 |