HA1 postcode district

Postcodes and sectors

960 of the district's 1,796 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 51.58034, -0.33862, which locates the district, not a building.

Companies registered in HA1

Companies House lists 16,784 companies with a registered office in HA1; 10,258 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 HA1

• Greater London
• London
• Harrow
• Brent
• Wembley

Roads filed under HA1

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.

• Althorpe Road
• Amery Road
• Andrews Close
• Angel Road
• Arden Close
• Ashburnham Avenue
• Ashburnham Gardens
• Ashneal Gardens
• Badgers Close
• Badminton Close
• Balfour Road
• Barons Mead
• Becket Fold
• Bedford Road
• Bengeworth Road
• Beresford Road
• Bessborough Road
• Bethecar Road
• Blawith Road
• Bolton Road
• Bonnersfield Close
• Bonnersfield Lane
• Bouverie Road
• Bowen Road
• Brook Drive
• Buckingham Road
• Butler Avenue
• Butler Road
• Byron Road
• Calotype Lane
• Canterbury Road
• Carnegie Road
• Catherine Place
• Cavendish Avenue
• Chandos Road
• Charles Crescent
• Church Hill
• Clarendon Road
• Colbeck Road
• Collapit Close
• College Road
• Colton Road
• Cornwall Road
• Courtfield Avenue
• Courtfield Crescent
• Crofts Road
• Cross Road
• Crystal Way
• Cumberland Road
• Cunningham Park
• Danes Gate
• Delamotte Close
• Devonshire Road
• Dorset Road
• Drury Road
• Duarte Close
• Duffield Close
• Dukes Avenue
• Durham Road
• Earls Crescent

Check an address in HA1

Check an address in HA1

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=HA1" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about HA1

What does an HA1 postcode tell you?

That the address lies in the HA1 district of the HA (Harrow) postcode area, and the place OS Open Names most often lists first for its postcodes is Harrow. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 960 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 HA1

• HA21.7 km
• HA31.9 km
• HA53.7 km
• HA73.9 km
• HA04.0 km
• HA94.3 km
• UB64.6 km
• UB54.9 km
• HA45.1 km
• HA85.7 km
• NW95.9 km
• WD196.7 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids