SW20 postcode district: Merton and around

SW20 is a postcode district in England, with 570 postcodes in use in 4 sectors. It has postcodes in Merton and Kingston upon Thames. It is split between 2 councils: Merton (561 postcodes) and Kingston upon Thames (9).

Postcodes in use: 570
Sectors: 4
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 SW20, and which are new since 2020

New since 2020: 29
In use before 2020: 541
Outline: where 5 or more new postcodes since 2020 lie together

Of the 570 postcodes in SW20 that ONS places, 29 are new since 2020 and 541 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. Names in italics are council wards: we hold no town or village names here.

The middle of its postcodes: latitude 51.4108, longitude -0.2279. 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

SW20 8DPApril 2026 SW20 9AYApril 2026 SW20 9BFMarch 2026 SW20 9BJMarch 2026 SW20 9BLMarch 2026

Where the new postcodes lie together

9 new postcodes since 2020, outlined on the map. SW20 2HD, is the newest of them.
9 new postcodes since 2020, outlined on the map. SW20 9AY, is the newest of them.

What broadband can you get in SW20?

Ofcom reports on 531 of the 570 postcodes in SW20. At 452 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit452 of 531

Postcodes where every home can get superfast524 of 531

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 SW20 at risk of flooding?

41 of the 570 postcodes in SW20 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 412 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 41 of 570 postcodes High: 271Medium: 141Low: 349

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

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 SW20?

Homes in SW20 sold for a typical £690,000 in the 12 months to August 2026, across 287 sales, down 5.5% on the 12 months before, HM Land Registry's figures show.

£690,000 typical price, the 12 months to August 2026

£730,000 12 months to August 2025

▼ down 5.5% on the 12 months before

Detached £1,605,000 13 sales
Semi-detached £920,000 55 sales
Terraced £858,000 113 sales
Flat or maisonette £430,000 106 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