All postcodes in HP4 9
| Postcode | Place | Type |
|---|---|---|
| HP4 9DD | Berkhamsted | large user |
| HP4 9DR | Berkhamsted | large user |
| HP4 9EP | Berkhamsted | large user |
| HP4 9ES | Berkhamsted | large user |
| HP4 9FD | Berkhamsted | large user |
| HP4 9FL | Berkhamsted | large user |
| HP4 9FN | Berkhamsted | large user |