Districts in the UB area
| District | Main place | Local authority | Sectors | Postcodes |
|---|---|---|---|---|
| UB1 | Southall | Ealing | 4 | 615 |
| UB2 | Southall | Ealing | 2 | 532 |
| UB3 | Hayes | Hillingdon | 6 | 987 |
| UB4 | Hayes | Hillingdon | 3 | 704 |
| UB5 | Northolt | Ealing | 4 | 840 |
| UB6 | Greenford | Ealing | 4 | 860 |
| UB7 | West Drayton | Hillingdon | 4 | 632 |
| UB8 | London | Hillingdon | 4 | 825 |
| UB9 | Harefield | Buckinghamshire | 3 | 431 |
| UB10 | London | Hillingdon | 3 | 712 |
| UB11 | London | Hillingdon | 1 | 19 |
| UB18 | Southall | Ealing | 2 | 59 |