HP
24 districts, 14,106 postcodes
Buckinghamshire, Dacorum, Three Rivers, St Albans, South Oxfordshire, Cherwell, and others
| District | Postcodes | Local authority |
|---|---|---|
| HP1 | 686 | Dacorum |
| HP10 | 565 | Buckinghamshire |
| HP11 | 492 | Buckinghamshire |
| HP12 | 491 | Buckinghamshire |
| HP13 | 847 | Buckinghamshire |
| HP14 | 541 | Buckinghamshire |
| HP15 | 423 | Buckinghamshire |
| HP16 | 374 | Buckinghamshire |
| HP17 | 372 | Buckinghamshire |
| HP18 | 694 | Buckinghamshire |
| HP19 | 594 | Buckinghamshire |
| HP2 | 988 | Dacorum |
| HP20 | 531 | Buckinghamshire |
| HP21 | 725 | Buckinghamshire |
| HP22 | 968 | Buckinghamshire |
| HP23 | 576 | Dacorum |
| HP27 | 446 | Buckinghamshire |
| HP3 | 763 | Dacorum |
| HP4 | 736 | Dacorum |
| HP5 | 730 | Buckinghamshire |
| HP6 | 431 | Buckinghamshire |
| HP7 | 359 | Buckinghamshire |
| HP8 | 220 | Buckinghamshire |
| HP9 | 554 | Buckinghamshire |