SM4 postcode district: Merton and around
SM4 is a postcode district in England, with 581 postcodes in use in 4 sectors. It has postcodes in Merton and Sutton. It is split between 2 councils: Merton (533 postcodes) and Sutton (48).
- Postcodes in use
- 581
- Sectors
- 4
- Councils
- 2 councils
- Places
- 2 places
Source: ONS Postcode Directory, August 2026, loaded 20 October 2026.
Every postcode in SM4, by gigabit broadband
- No home or business can get gigabit: 11
- Some can get gigabit: 50
- Every home and business can get gigabit: 482
- Ofcom gives no figure: 38
Of the 581 postcodes in SM4 that ONS places, 11 have no home or business that can get gigabit, 50 have some that can, 482 can all get it and 38 have no Ofcom figure.
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. 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 51.3930, longitude -0.1997. Open this area on OpenStreetMap
Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. 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.
Postcodes without gigabit
What broadband can you get in SM4?
Ofcom reports on 543 of the 581 postcodes in SM4. At 482 of them every home and business can get gigabit broadband.
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 checkerSource: Ofcom Connected Nations, Connected Nations, Spring 2026, data for January 2026.
Is SM4 at risk of flooding?
58 of the 581 postcodes in SM4 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 109 homes and businesses in an area at high or medium risk.
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 flood risk, published 6 July 2026.
What do homes sell for in SM4?
Homes in SM4 sold for a typical £489,250 in the 12 months to September 2026, across 250 sales, HM Land Registry's figures show. The 12 months before gave £510,000 from 351 sales: not a change larger than chance would explain, given which homes happened to sell.
- Detached 3 sales, too few to price
- Semi-detached £605,000 37 sales
- Terraced £539,000 137 sales
- Flat or maisonette £320,000 73 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 October 2026.
Postcodes in SM4
Pick a sector, then a postcode. A sector is the district plus the next digit.
UK postcode format explainedPlaces in SM4
Towns and villages with postcodes in SM4, and how many each has here.
Who covers SM4
How many of the district's postcodes in use fall under each council, constituency and police force area.
Councils
What council am I in?Constituencies
- Mitcham and Morden471
- Wimbledon62
- Carshalton and Wallington48
Police force areas
- Metropolitan Police581
Next to SM4
"Next to" is by number: the districts before and after SM4 in the SM area.
Check a postcode
Where the facts on this page come from
- Office for National Statistics: ONS Postcode Directory
- Ofcom Connected Nations
- Environment Agency flood risk
- HM Land Registry Price Paid Data
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0.
Licence: Open Government Licence v3.0.
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