W1S postcode district

Postcodes and sectors

554 of the district's 867 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 51.51121, -0.14239, which locates the district, not a building.

Companies registered in W1S

Companies House lists 7,835 companies with a registered office in W1S; 5,806 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 W1S

• City of Westminster
• Greater London
• London

Roads filed under W1S

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.

• Albemarle Street
• Blenheim Street
• Boyle Street
• Bruton Lane
• Burlington Gardens
• Clifford Street
• Coach and Horses Yard
• Conduit Street
• Cork St Mews
• Cork Street
• Dering Street
• Dover Street
• Grafton Street
• Hanover Square
• Hanover Street
• Lancashire Court
• Maddox Street
• Mason's Arms Mews
• Medici Courtyard
• Mill Street
• New Bond Street
• New Burlington Place
• New Burlington Street
• Old Bond Street
• Old Burlington Street
• Pollen Street
• Princes Street
• Royal Arcade
• Sackville Street
• Savile Row
• Stafford Street
• St George Street
• Tenterden Street
• Vigo Street
• B406

Check an address in W1S

Check an address in W1S

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=W1S" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about W1S

What does a W1S postcode tell you?

That the address lies in the W1S 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 554 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 W1S

• W1B0.4 km
• W1J0.4 km
• W1F0.5 km
• W1C0.6 km
• W1K0.6 km
• SW1Y0.7 km
• W1D0.7 km
• W1W0.9 km
• W1G1.0 km
• SW1A1.0 km
• WC2H1.1 km
• W1T1.1 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids