HA9 postcode district

Postcodes and sectors

1,006 of the district's 1,947 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 51.56064, -0.28507, which locates the district, not a building.

Companies registered in HA9

Companies House lists 8,206 companies with a registered office in HA9; 2,451 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 HA9

• Brent
• Greater London
• London
• Wembley

Roads filed under HA9

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 Avenue
• Albion Way
• Aldbury Avenue
• Allegro Walk
• Allonby Gardens
• Alverstone Road
• Ambleside Gardens
• Anton Place
• Arnside Gardens
• Ashley Gardens
• Atlantic Cres
• Atlas Road
• Aylands Close
• Babington Rise
• Barn Hill
• Barnhill Road
• Barn Rise
• Barn Way
• Basing Hill
• Beatrice Avenue
• Beechcroft Gardens
• Bell Lane
• Berkhamsted Avenue
• Beverley Gardens
• Blenheim Gardens
• Boundary Road
• Bovingdon Avenue
• Bowater Road
• Bowling Green Court
• Brampton Grove
• Brent Green Walk
• Brent Way
• Bridge Road
• Brook Avenue
• Buddings Circle
• Carey Way
• Carlton Avenue East
• Castleton Avenue
• Cecil Avenue
• Chalfont Avenue
• Chalkhill Road
• Chalklands
• Chamberlayne Avenue
• Charlton Road
• Chatsworth Avenue
• Chippenham Avenue
• Clarendon Gardens
• Clifton Avenue
• College Road
• Coniston Gardens
• Conway Gardens
• Corinium Close
• Corringham Road
• Courtenay Road
• Crown Green Mews
• Crown Walk
• Dagmar Avenue
• Demeta Close
• Dennis Avenue
• Derek Avenue

Check an address in HA9

Check an address in HA9

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=HA9" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about HA9

What does an HA9 postcode tell you?

That the address lies in the HA9 district of the HA (Harrow) postcode area, and the place OS Open Names most often lists first for its postcodes is Wembley. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,006 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 HA9

• HA01.8 km
• NW103.3 km
• NW93.7 km
• HA14.3 km
• HA34.4 km
• NW24.5 km
• UB64.5 km
• NW45.1 km
• W55.4 km
• HA25.5 km
• W35.6 km
• HA85.7 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids