TW
21 districts, 11,118 postcodes
Hounslow, Richmond upon Thames, Spelthorne, Runnymede, Hillingdon, Windsor and Maidenhead, and others
| District | Postcodes | Local authority |
|---|---|---|
| TW1 | 666 | Richmond upon Thames |
| TW10 | 512 | Richmond upon Thames |
| TW11 | 558 | Richmond upon Thames |
| TW12 | 563 | Richmond upon Thames |
| TW13 | 694 | Hounslow |
| TW14 | 478 | Hounslow |
| TW15 | 660 | Spelthorne |
| TW16 | 538 | Spelthorne |
| TW17 | 415 | Spelthorne |
| TW18 | 749 | Spelthorne |
| TW19 | 386 | Spelthorne |
| TW2 | 550 | Richmond upon Thames |
| TW20 | 656 | Runnymede |
| TW3 | 785 | Hounslow |
| TW4 | 428 | Hounslow |
| TW5 | 400 | Hounslow |
| TW6 | 124 | Hillingdon |
| TW7 | 761 | Hounslow |
| TW8 | 537 | Hounslow |
| TW9 | 600 | Richmond upon Thames |
| TW98 | 58 | — |