NP postcode district map, Pontypool
Supplier statuses last checked .
We’re re-checking Welsh Water. Its last confirmed status is still shown here, because hiding a restriction we cannot currently re-read is the more expensive mistake, last confirmed 29 days ago.
The NP postcode area covers 18 districts and 13,893 live postcodes, from NP4 to NP44. It is centred on Casnewydd and also covers Pontypool, Cwmbrân, Abergavenny, Trecceln and Y Coed Duon.
Districts here average 772 postcodes.
Where the NP districts sit
1 district is plotted without a label where labels would overlap; every one is in the table below.
Where NP sits
It is administratively fragmented, reaching into Monmouthshire, Newport, Caerphilly and Torfaen and 4 other authorities.
NP spans the border: 13,662 of its postcodes are in Wales and 231 in England, about 2 per cent. That matters here in a way it does not on a plain postcode map, because water is regulated separately either side of it. In England the Environment Agency oversees drought and abstraction; in Wales it is Natural Resources Wales, and restrictions are set by whichever company supplies the address, not by which country it sits in.
Water supply across NP
All 18 NP districts are supplied by Welsh Water. That makes NP simple in a way many areas are not: one company, one set of rules, one status to check.
No hosepipe ban currently applies anywhere in NP.
The shape of the NP area
NP4 is the largest district with 1,371 postcodes around Pontypool, and NP24 the smallest with 147. The area divides into 86 postcode sectors.
The numbering is not continuous. NP runs up to 44 but has only 18 districts, so 23 numbers are unused:.
Several districts share a settlement, which is a common source of confusion when a form rejects an address: NP10, NP19 and NP20 all point at Casnewydd.
What borders NP
NP sits next to CF (Cardiff) to the south west, BS (Bristol) to the south east, HR (Hereford) to the north, LD (Llandrindod Wells) to the north west and GL (Gloucester) to the east.
Its neighbours run in 5 different directions, so NP is landlocked by other postcode areas on most sides.
NP districts, settlements and water supply
| District | Principal settlement | Water company | Hosepipe ban status |
|---|---|---|---|
| NP4 | Pontypool | Welsh Water | No restrictions |
| NP7 | Abergavenny | Welsh Water | No restrictions |
| NP8 | Crughywel | Welsh Water | No restrictions |
| NP10 | Casnewydd | Welsh Water | No restrictions |
| NP11 | Trecceln | Welsh Water | No restrictions |
| NP12 | Y Coed Duon | Welsh Water | No restrictions |
| NP13 | Abertyleri | Welsh Water | No restrictions |
| NP15 | Usk | Welsh Water | No restrictions |
| NP16 | Chepstow | Welsh Water | No restrictions |
| NP18 | Caerllion | Welsh Water | No restrictions |
| NP19 | Casnewydd | Welsh Water | No restrictions |
| NP20 | Casnewydd | Welsh Water | No restrictions |
| NP22 | Tredegar | Welsh Water | No restrictions |
| NP23 | Ebbw Vale | Welsh Water | No restrictions |
| NP24 | Bargod | Welsh Water | No restrictions |
| NP25 | Monmouth | Welsh Water | No restrictions |
| NP26 | Cil-y-coed | Welsh Water | No restrictions |
| NP44 | Cwmbrân | Welsh Water | No restrictions |
Principal settlement is the town or city each district sits in or nearest to, derived from OS Open Names. It is not the Royal Mail post town, which is licensed data and not published openly. Status is resolved live from each company’s own notice.
Water hardness in NP
No water company covering NP publishes hardness figures as open data. The gap is named per district below so you know who to ask.
| District | Hardness | As published | Supply zone | Published by |
|---|---|---|---|---|
| NP4 | Not published by Welsh Water. Check with your supplier. | |||
| NP7 | Not published by Welsh Water. Check with your supplier. | |||
| NP8 | Not published by Welsh Water. Check with your supplier. | |||
| NP10 | Not published by Welsh Water. Check with your supplier. | |||
| NP11 | Not published by Welsh Water. Check with your supplier. | |||
| NP12 | Not published by Welsh Water. Check with your supplier. | |||
| NP13 | Not published by Welsh Water. Check with your supplier. | |||
| NP15 | Not published by Welsh Water. Check with your supplier. | |||
| NP16 | Not published by Welsh Water. Check with your supplier. | |||
| NP18 | Not published by Welsh Water. Check with your supplier. | |||
| NP19 | Not published by Welsh Water. Check with your supplier. | |||
| NP20 | Not published by Welsh Water. Check with your supplier. | |||
| NP22 | Not published by Welsh Water. Check with your supplier. | |||
| NP23 | Not published by Welsh Water. Check with your supplier. | |||
| NP24 | Not published by Welsh Water. Check with your supplier. | |||
| NP25 | Not published by Welsh Water. Check with your supplier. | |||
| NP26 | Not published by Welsh Water. Check with your supplier. | |||
| NP44 | Not published by Welsh Water. Check with your supplier. | |||
Hardness is published per census area, not per postcode, so these figures characterise a district rather than measuring one address. They are a scale and taste matter, not a safety one. Hardness data version wessex-water@2022-2025+yorkshire-water@2026.
Download the NP data
No signup, no email wall. GeoJSON carries the district points, the supplier and the live status, so it can be dropped straight into a map.
District positions are averaged postcode centroids from OS Code-Point Open. They show roughly where a district sits, not where its boundary runs, and are not legal boundaries.
Frequently asked questions
How many postcode districts are in the NP area?
There are 18 NP postcode districts, running from NP4 to NP44, and they contain 13,893 live postcodes across 86 sectors.
What towns does the NP postcode area cover?
NP covers Casnewydd, Pontypool, Cwmbrân, Abergavenny, Trecceln and Y Coed Duon. The area takes its name from Casnewydd, and each district is listed with its settlement in the table on this page.
Which water company supplies NP postcodes?
Welsh Water supplies all 18 NP districts. Supply boundaries follow the pipe network rather than postcode geography, so confirm against your water bill if you are near the edge of the area.
Is the NP postcode area in Wales or England?
Both. 13,662 NP postcodes are in Wales and 231 are in England. The postcode does not decide which applies: your water company does, and water is regulated separately either side of the border.
Why do NP10 and NP19 both say Casnewydd?
NP10, NP19 and NP20 all serve Casnewydd, covering different parts of it. A single town routinely needs more than one postcode district once it passes a few thousand delivery points, so this is normal rather than an error in an address.
Can I download a free NP postcode map?
Yes. This page offers the NP districts as GeoJSON, CSV and SVG, free and with no signup or email address required. The GeoJSON carries each district's position, its water company and its current restriction status, so it can be dropped straight into a mapping tool.
Which councils cover the NP postcode area?
NP reaches into Monmouthshire, Newport, Caerphilly, Torfaen, Blaenau Gwent, Gloucestershire, Powys and County of Herefordshire. A postcode area is not a council area: they were drawn for different purposes and a single district can sit across a council boundary, so your postcode does not tell you which authority you pay.