HP1 postcode district

Postcodes and sectors

681 of the district's 1,295 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 51.75644, -0.48824, which locates the district, not a building.

Companies registered in HP1

Companies House lists 2,133 companies with a registered office in HP1; 590 of them at addresses shared by 25 or more companies (1 October 2026 snapshot). 25 is the count at which the address lookup reports a company cluster.

Places OS Open Names lists for HP1

• Dacorum
• Hertfordshire
• Eastern
• Hemel Hempstead
• Great Gaddesden
• Water End
• Fields End
• Nettleden
• Frithsden

Roads filed under HP1

Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.

• Adrian Close
• Alston Road
• Anchor Lane
• Armstrong Place
• Ashtree Way
• Aspens Place
• Aspfield Row
• Astley Road
• Aubreys Road
• Bank Court
• Barberry Road
• Bards Corner
• Bargrove Avenue
• Beaumayes Close
• Beechfield Road
• Benchleys Road
• Berkhamsted Road
• Betjeman Way
• Bingham Close
• Birch Green
• Bishops Mead
• Bluebell Close
• Bodwell Close
• Bosworth Close
• Bourne End Lane
• Boxted Road
• Briarcliff
• Bridge Street
• Broom Hill
• Bulbourne Close
• Bulbourne Mews
• Bullace Close
• Bury Green
• Bury Hill
• Bury Hill Close
• Bury Road
• Butts End
• Campion Road
• Cangels Close
• Cardy Road
• Castle Mead
• Catkin Close
• Cemetery Hill
• Cemmaes Court Road
• Cemmaes Meadow
• Chalkdell Close
• Chardins Close
• Charles Street
• Chasden Road
• Chaulden House Gardens
• Chaulden Lane
• Chaulden Terrace
• Cherry Orchard
• Church Meadow
• Clementine Way
• Clover Way
• Coles Hill
• Collett Road
• Combe Street
• Cooks Vennel

Check an address in HP1

Check an address in HP1

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=HP1" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about HP1

What does an HP1 postcode tell you?

That the address lies in the HP1 district of the HP (Hemel Hempstead) postcode area, and the place OS Open Names most often lists first for its postcodes is Hemel Hempstead. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 681 live postcodes.

Where the counts come from

• ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
• os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
• uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0

What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.

Data synced on 2026-11-01: the newest version among the datasets listed above.

Districts nearest HP1

• HP32.6 km
• HP22.7 km
• HP45.7 km
• WD46.0 km
• WD57.7 km
• AL38.1 km
• HP59.6 km
• WD2510.4 km
• WD2411.1 km
• AL211.3 km
• AL111.4 km
• AL511.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids