| Locality | Postal Code |
|---|---|
| Postal/ZIP Codes in Whitehouse | MK8 |
| Postal/ZIP Codes in Willen | MK15 |
| Postal/ZIP Codes in Willen Park | MK15 |
| Postal/ZIP Codes in Winterhill | MK6 1AP, MK6 1BW |
| Postal/ZIP Codes in Woburn Sands | MK17 |
| Postal/ZIP Codes in Wolverton | MK12 |
| Postal/ZIP Codes in Wolverton Mill | MK12 |
| Postal/ZIP Codes in Woolstone | MK15 |
| Postal/ZIP Codes in Woughton on the Green | MK6 |
| Postal/ZIP Codes in Woughton Park | MK6 |
| Postal/ZIP Codes in Wymbush | MK8 |