HA0 postcode district

Postcodes and sectors

860 of the district's 1,640 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 51.55102, -0.30527, which locates the district, not a building.

Companies registered in HA0

Companies House lists 5,213 companies with a registered office in HA0; 347 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 HA0

• London
• Greater London
• Brent
• Wembley
• Ealing

Roads filed under HA0

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.

• Abbey Avenue
• Abbeydale Road
• Abbotts Drive
• Acorn Close
• Ada Road
• Alliance Close
• Alperton Lane
• Ander Close
• Ash Grove
• Ash Walk
• Aspen Drive
• Atherton Heights
• Athlon Road
• Atlip Road
• Audrey Gardens
• Bamford Avenue
• Barham Close
• Barley Close
• Bassingham Road
• Beaumont Avenue
• Beaumont Court
• Belmont Avenue
• Beresford Avenue
• Blockley Road
• Bowrons Avenue
• Braemar Avenue
• Bramley Lodge
• Brentvale Avenue
• Brewery Close
• Bridgehill Close
• Bridgewater Road
• Bridgeway
• Brindley Close
• Burnside Crescent
• Burns Road
• Byron Road
• Campden Crescent
• Carlton Avenue West
• Carlyon Close
• Carlyon Road
• Central Road
• Chaplin Road
• Charterhouse Avenue
• Cherry Close
• Cherry Tree Close
• Chestnut Avenue
• Chestnut Grove
• Chilcott Close
• Christchurch Avenue
• Christchurch Green
• Church Gardens
• Clayton Avenue
• Clifford Road
• Clifton Way
• Codling Way
• Colyton Close
• Compton Avenue
• Conifer Way
• Copland Avenue
• Copland Close

Check an address in HA0

Check an address in HA0

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=HA0" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about HA0

What does an HA0 postcode tell you?

That the address lies in the HA0 district of the HA (Harrow) postcode area, and the place OS Open Names most often lists first for its postcodes is London. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 860 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 HA0

• HA91.8 km
• UB62.8 km
• HA14.0 km
• NW104.1 km
• W54.2 km
• W134.4 km
• HA24.6 km
• W74.8 km
• HA34.9 km
• UB55.0 km
• W35.2 km
• NW95.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids