W1J postcode district

Postcodes and sectors

666 of the district's 943 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 51.50786, -0.14508, which locates the district, not a building.

Companies registered in W1J

Companies House lists 5,549 companies with a registered office in W1J; 2,807 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 W1J

• Greater London
• London
• City of Westminster
• Islington

Roads filed under W1J

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.

• Albany Courtyard
• Ashburton Place
• Barlow Place
• Berkeley Square
• Berkeley Street
• Bolton Street
• Brick Street
• Bruton Place
• Bruton Street
• Burlington Arcade
• Carrington Street
• Charles Street
• Chesterfield Gardens
• Chesterfield Hill
• Chesterfield Street
• Clarges Mews
• Clarges Street
• Constitution Hill
• Curzon Square
• Curzon Street
• Derby Street
• Dover Yard
• Down Street
• Down Street Mews
• Eagle Place
• Farm Street
• Fitzmaurice Place
• Half Moon Street
• Hamilton Mews
• Hamilton Place
• Hay's Mews
• Hay Hill
• Hertford Street
• Hill Street
• Jones Street
• Lansdowne Row
• Market Mews
• Mayfair Place
• Mayfair Row
• Picadilly Arcade
• Piccadilly
• Piccadilly Place
• Pitt's Head Mews
• Queen Street
• Red Lion Yard
• Shepherd Market
• Shepherd Street
• Stanhope Row
• Stratton Street
• Trebeck Street
• Vine Street
• Waverton Street
• White Horse Street
• Yarmouth Place

Check an address in W1J

Check an address in W1J

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=W1J" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about W1J

What does a W1J postcode tell you?

That the address lies in the W1J district of the W (West London) postcode area, and the place OS Open Names most often lists first for its postcodes is City of Westminster. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 666 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 W1J

• W1S0.4 km
• W1K0.5 km
• SW1Y0.7 km
• W1B0.8 km
• W1C0.8 km
• W1F0.9 km
• SW1A1.0 km
• W1D1.1 km
• SW1E1.1 km
• W1G1.3 km
• W1W1.3 km
• SW1H1.3 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids