W1B postcode district
W1B, in the W (West London) postcode area, has 297 live and 248 terminated postcodes in the ONS Postcode Directory of August 2026, and OS Open Names files 22 roads under it.
| postcode area | W (West London) |
|---|---|
| live postcodes | 297 |
| terminated postcodes | 248 |
| sectors | 5 |
| roads listed | 22 |
| companies registered | 7,205 |
| centroid | 51.51438, -0.14095 |
| directory release | 2026-08 |
Postcodes and sectors
297 of the district's 545 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 51.51438, -0.14095, which locates the district, not a building.
| sector | live | terminated |
|---|---|---|
| W1B 1 | 65 | 37 |
| W1B 2 | 49 | 31 |
| W1B 3 | 18 | 35 |
| W1B 4 | 65 | 69 |
| W1B 5 | 100 | 76 |
Companies registered in W1B
Companies House lists 7,205 companies with a registered office in W1B; 6,355 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 W1B
- City of Westminster
- Greater London
- London
Roads filed under W1B
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.
- Air Street
- All Souls' Place
- Duchess Street
- Glasshouse Street
- Heddon Street
- Kingly Court
- Kingly Street
- Langham Place
- Little Argyll Street
- Little Marlborough Street
- Man in Moon Passage
- New Cavendish Street
- Park Crescent
- Portland Place
- Regent Place
- Regent Street
- Swallow Passage
- Swallow Place
- Swallow Street
- Tenison Court
- Warwick Street
- Wilder Walk
Check an address in W1B
The same road list through the API, from the outward code alone:
curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=W1B" \ -H "Authorization: Bearer $SPAW_KEY"
Common questions about W1B
- What does a W1B postcode tell you?
- That the address lies in the W1B 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 297 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 W1B
- W1F0.3 km
- W1S0.4 km
- W1W0.5 km
- W1C0.6 km
- W1D0.6 km
- W1T0.7 km
- W1G0.7 km
- W1J0.8 km
- W1K0.8 km
- SW1Y0.9 km
- WC2H0.9 km
- WC1E1.0 km
- Every district
- How a British address is written
- Check any address
distance between the districts' centroids
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