SW1X postcode district

Postcodes and sectors

402 of the district's 926 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 51.49824, -0.15675, which locates the district, not a building.

Companies registered in SW1X

Companies House lists 2,145 companies with a registered office in SW1X; 988 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 SW1X

• Greater London
• London
• City of Westminster
• Chelsea
• Kensington and Chelsea
• Wandsworth

Roads filed under SW1X

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.

• Albert Gate
• Apsley Way
• Belgrave Mews North
• Belgrave Mews South
• Belgrave Mews West
• Belgrave Place
• Belgrave Square
• Bowland Yard
• Brompton Road
• Cadogan Gate
• Cadogan Lane
• Cadogan Place
• Cadogan Square
• Capener's Close
• Chapel Street
• Chesham Close
• Chesham Mews
• Chesham Place
• Chesham Street
• Chester Close
• Chester Mews
• Chester Street
• Clabon Mews
• D'oyley Street
• Duke of Wellington Place
• Duplex Ride
• Eaton Mews North
• Eaton Place
• Eccleston Mews
• Ellis Street
• Groom Place
• Grosvenor Crescent
• Grosvenor Crescent Mews
• Grosvenor Place
• Halkin Arcade
• Halkin Mews
• Halkin Place
• Halkin Street
• Hans Crescent
• Hans Place
• Hans Street
• Harriet Street
• Harriet Walk
• Headfort Place
• Herbert Crescent
• Kinnerton Place North
• Kinnerton Place South
• Kinnerton Street
• Kinnerton Yard
• Knights Arcade
• Knightsbridge
• Knightsbridge Green
• Landon Place
• Lanesborough Place
• Lennox Gardens
• Little Chester Street
• Lowndes Close
• Lowndes Place
• Lowndes Square
• Lowndes Street

Check an address in SW1X

Check an address in SW1X

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=SW1X" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about SW1X

What does an SW1X postcode tell you?

That the address lies in the SW1X district of the SW (South 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 402 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 SW1X

• SW1W0.7 km
• SW31.2 km
• SW1E1.2 km
• W1J1.3 km
• SW71.4 km
• W1K1.5 km
• SW1V1.5 km
• SW1H1.6 km
• W1S1.8 km
• SW1A1.8 km
• SW1Y1.9 km
• W1C1.9 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids