SW1Y postcode district: City of Westminster and around

SW1Y is a postcode district in England, with 183 postcodes in use in 3 sectors. It has postcodes in City of Westminster and Wandsworth. It is split between 2 councils: Westminster (182 postcodes) and Wandsworth (1).

Postcodes in use: 183
Sectors: 3
Councils: 2 councils
Places: 2 places

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

Every postcode in SW1Y, and which are new since 2020

New since 2020: 3
In use before 2020: 180

Of the 183 postcodes in SW1Y that ONS places, 3 are new since 2020 and 180 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 51.5076, longitude -0.1345. 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 3 newest postcodes

SW1Y 5NPJuly 2025 SW1Y 4QLOctober 2024 SW1Y 6RLOctober 2022

Further out, not drawn

This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.

SW1Y 5ZQ

What broadband can you get in SW1Y?

Ofcom reports on 168 of the 183 postcodes in SW1Y. At 144 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit144 of 168

Postcodes where every home can get superfast144 of 168

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 SW1Y at risk of flooding?

None of the 183 postcodes in SW1Y 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 SW1Y?

Homes in SW1Y sold for a typical £900,000 in the 12 months to August 2026, across 7 sales, HM Land Registry's figures show.

£900,000 typical price, the 12 months to August 2026

Flat or maisonette £900,000 7 sales

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