TW3 postcode district: Hounslow and around

TW3 is a postcode district in England, with 787 postcodes in use in 5 sectors. It has postcodes in Hounslow and Richmond upon Thames. It is split between 2 councils: Hounslow (759 postcodes) and Richmond upon Thames (28).

Postcodes in use: 787
Sectors: 5
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 TW3, and which are new since 2020

New since 2020: 75
In use before 2020: 712
Outline: where 5 or more new postcodes since 2020 lie together

Of the 787 postcodes in TW3 that ONS places, 75 are new since 2020 and 712 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. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode.

The middle of its postcodes: latitude 51.4683, longitude -0.3640. 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

TW3 9BQJune 2026 TW3 4GBMay 2026 TW3 9BSApril 2026 TW3 9BTApril 2026 TW3 4GEFebruary 2026

Where the new postcodes lie together

39 new postcodes since 2020, outlined on the map. TW3 9BQ, is the newest of them.
19 new postcodes since 2020, outlined on the map. TW3 4GB, is the newest of them.
8 new postcodes since 2020, outlined on the map. TW3 1DY, is the newest of them.

What broadband can you get in TW3?

Ofcom reports on 668 of the 787 postcodes in TW3. At 516 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit516 of 668

Postcodes where every home can get superfast631 of 668

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 TW3 at risk of flooding?

None of the 787 postcodes in TW3 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 TW3?

Homes in TW3 sold for a typical £435,000 in the 12 months to August 2026, across 186 sales, up 2.4% on the 12 months before, HM Land Registry's figures show.

£435,000 typical price, the 12 months to August 2026

£425,000 12 months to August 2025

▲ up 2.4% on the 12 months before

Detached £558,580 8 sales
Semi-detached £570,000 51 sales
Terraced £500,000 53 sales
Flat or maisonette £286,500 74 sales

Each bar is that kind's typical price, against the most expensive kind here.

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