W1K postcode district

Postcodes and sectors

878 of the district's 1,172 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 51.51112, -0.15103, which locates the district, not a building.

Companies registered in W1K

Companies House lists 5,435 companies with a registered office in W1K; 3,718 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 W1K

• City of Westminster
• Greater London
• London

Roads filed under W1K

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.

• Achilles Way
• Adam's Row
• Aldford Street
• Archibald Mews
• Avery Row
• Balderton Street
• Balfour Mews
• Balfour Place
• Binney Street
• Blackburne's Mews
• Bloomfield Place
• Bourdon Place
• Bourdon Street
• Broadbent Street
• Broad Walk
• Brook's Mews
• Brook Street
• Brown Hart Gardens
• Carlos Place
• Carpenter Street
• Culross Street
• Curzon Gate
• Davies Street
• Deanery Mews
• Deanery Street
• Duke's Yard
• Dunraven Street
• George Yard
• Gilbert Street
• Globe Yard
• Grantham Place
• Green Street
• Grosvenor Hill
• Grosvenor Square
• Grosvenor Street
• Haunch of Venison Yard
• Lees Place
• Lovers' Walk
• Lumley Street
• Mount Row
• Mount Street
• Mount Street Mews
• North Audley Street
• North Row
• Old Park Lane
• Park Lane
• Park Street
• Providence Court
• Red Place
• Reeves Mews
• Rex Place
• Shepherds Place
• South Audley Street
• South Molton Lane
• South Molton Passage
• South Molton Street
• South Street
• Speakers' Corner
• Stanhope Gate
• St Anselm's Place

Check an address in W1K

Check an address in W1K

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=W1K" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about W1K

What does a W1K postcode tell you?

That the address lies in the W1K 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 878 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 W1K

• W1C0.4 km
• W1J0.5 km
• W1S0.6 km
• W1B0.8 km
• W1U0.9 km
• W1G0.9 km
• W1H1.0 km
• W1F1.0 km
• W1W1.1 km
• SW1Y1.2 km
• W1D1.3 km
• W1T1.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids