W1B postcode district: City of Westminster and around

W1B is a postcode district in England, with 297 postcodes in use in 5 sectors. It has postcodes in City of Westminster. Its council is Westminster.

Postcodes in use: 297
Sectors: 5
Council: Westminster
Places: City of Westminster

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in W1B, and which are new since 2020

New since 2020: 10
In use before 2020: 287

Of the 297 postcodes in W1B that ONS places, 10 are new since 2020 and 287 were in use before 2020.

Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. New since 2020 means it came into use in January 2020 or later. No boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode. Names in italics are council wards: we hold no town or village names here.

The middle of its postcodes: latitude 51.5144, longitude -0.1409. Open this area on OpenStreetMap

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them

The 5 newest postcodes

W1B 4HBMarch 2026 W1B 5DQFebruary 2025 W1B 5SRDecember 2023 W1B 5PYOctober 2023 W1B 4JGJanuary 2023

What broadband can you get in W1B?

Ofcom reports on 268 of the 297 postcodes in W1B. At 229 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit229 of 268

Postcodes where every home can get superfast235 of 268

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is W1B at risk of flooding?

None of the 297 postcodes in W1B is on the Environment Agency's list of postcodes with a home or business in an area at risk of flooding from rivers or the sea.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in W1B?

HM Land Registry records 3 sales of homes in W1B in the 12 months to August 2026: too few to give a typical price.

Flat or maisonette 3 sales, too few to price

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it