NP
18 districts, 13,881 postcodes
Newport, Monmouthshire, Torfaen, Caerphilly, Blaenau Gwent, Forest of Dean, and others
| District | Postcodes | Local authority |
|---|---|---|
| NP10 | 590 | Newport |
| NP11 | 912 | Caerphilly |
| NP12 | 903 | Caerphilly |
| NP13 | 551 | Blaenau Gwent |
| NP15 | 404 | Monmouthshire |
| NP16 | 781 | Monmouthshire |
| NP18 | 486 | Newport |
| NP19 | 1,179 | Newport |
| NP20 | 1,352 | Newport |
| NP22 | 601 | Blaenau Gwent |
| NP23 | 882 | Blaenau Gwent |
| NP24 | 147 | Caerphilly |
| NP25 | 577 | Monmouthshire |
| NP26 | 633 | Monmouthshire |
| NP4 | 1,372 | Torfaen |
| NP44 | 1,257 | Torfaen |
| NP7 | 1,066 | Monmouthshire |
| NP8 | 188 | Powys |