HP4 postcode district

Postcodes and sectors

737 of the district's 1,180 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 51.76797, -0.56904, which locates the district, not a building.

Companies registered in HP4

Companies House lists 2,631 companies with a registered office in HP4; 516 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 HP4

• Eastern
• Dacorum
• Hertfordshire
• Berkhamsted
• Potten End
• Buckinghamshire
• South East
• Little Gaddesden
• Dagnall
• Ringshall
• Hudnall
• Norcott Hill
• Rossway Park
• Central Bedfordshire
• Hudnall Corner
• Heath End

Roads filed under HP4

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.

• Acacia Grove
• Admiral Way
• Alderley Court
• Alderton Drive
• Alma Road
• Alyngton
• Anglefield Road
• Angle Place
• Applecroft
• Archive Mews
• Ashby Road
• Ashlyns Court
• Ashlyns Grove
• Ashlyns Road
• Ashridge Rise
• Bakers Row
• Balcary Gardens
• Ballinger Court
• Bank Mill
• Bank Mill Lane
• Barncroft Road
• Beacon Road
• Beckets Square
• Bede Court
• Bedford Street
• Beechcroft
• Beech Drive
• Beech Hill Court
• Bell Lane
• Belton Road
• Benningfield Gardens
• Berkhamsted Place
• Billet Lane
• Birch Place
• Birch Road
• Birtchnell Close
• Black Prince Yard
• Blegberry Gardens
• Boswick Lane
• Bourne Road
• Boxwell Road
• Bracken Hill
• Brakynbery
• Briar Close
• Briar Way
• Bridge Street
• Bridgewater Hill
• Bridgewater Road
• Bridle Way
• Brimstone Way
• Britwell Drive
• Broadwater
• Brook Lane
• Brownlow Road
• Browns Spring
• Bulbourne Close
• Bullbeggars Lane
• Byways
• Cambridge Terrace
• Campions Court

Check an address in HP4

Check an address in HP4

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=HP4" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about HP4

What does an HP4 postcode tell you?

That the address lies in the HP4 district of the HP (Hemel Hempstead) postcode area, and the place OS Open Names most often lists first for its postcodes is Berkhamsted. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 737 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 HP4

• HP15.7 km
• HP56.7 km
• HP237.1 km
• HP37.6 km
• HP28.1 km
• HP610.1 km
• WD410.3 km
• HP711.9 km
• LU612.4 km
• HP1612.7 km
• WD512.7 km
• AL313.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids