SM4
Postcode districtPostcode district covering Morden, Risley Close and St Helier, in Merton.
Approximate outline worked out by Open Index from the ONS Postcode Directory: each census output area belongs to the district that holds most of its postcodes. People, homes, recorded crime and broadband add up those output areas. House sales count every sale with an SM4 postcode. How census figures are added up
Radon Affected Area by postcode district
Worked out by Open Index · 2022
About 0% of people in SM4 live in a 1 km square that the radon atlas marks as a radon Affected Area.
How SM4 compares
Each dot is a postcode district. The black line marks the middle one.
Is SM4 safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in SM4 at a rate of 66.7 per 1,000 people.
That compares with 75.1 per 1,000 people across the SM postcode area.
In August 2026 alone, 215 cases of crime and anti-social behaviour were recorded in SM4.
In the 12 months to August 2026, the most common types were violence and sexual offences (913), anti-social behaviour (520) and other crime (417).
A year earlier, the recorded crime rate in SM4 was 65.3 per 1,000 people.
Worked out by Open Index from police.uk crime records and ONS and NISRA population estimates.
Rates are per resident, so places that many people work in or visit, such as Westminster, the City of London and other city centres, have far higher rates than their residents alone would suggest.
Deprivation in SM4, neighbourhood by neighbourhood
- Deprivation is ranked by neighbourhood, so SM4 has no single figure. Of its 23 neighbourhoods with a rank:
- Decile 2: 1 neighbourhood
- Decile 4: 5 neighbourhoods
- Decile 5: 3 neighbourhoods
- Decile 6: 3 neighbourhoods
- Decile 7: 1 neighbourhood
- Decile 8: 3 neighbourhoods
- Decile 9: 2 neighbourhoods
- Decile 10 (England’s least deprived 10%): 5 neighbourhoods
English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.
Neighbourhoods in SM4
| Name | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
|---|---|---|---|---|
| Merton 021A | 1,382 | 45.5 per 1,000 | 10 | 100.0% |
| Merton 021B | 1,698 | 18.0 per 1,000 | 10 | 99.2% |
| Merton 021C | 1,817 | 18.6 per 1,000 | 10 | 100.0% |
| Merton 021D | 1,486 | 24.4 per 1,000 | 10 | 100.0% |
| Merton 021E | 1,594 | 47.8 per 1,000 | 8 | 98.5% |
| Merton 022C | 2,031 | 54.5 per 1,000 | 6 | 95.6% |
| Merton 023A | 1,976 | 292.0 per 1,000 | 5 | 88.4% |
| Merton 023B | 1,742 | 59.7 per 1,000 | 5 | 99.7% |
| Merton 023C | 1,590 | 72.0 per 1,000 | 4 | 98.8% |
| Merton 023D | 2,301 | 47.8 per 1,000 | 6 | 99.3% |
| Merton 023E | 1,839 | 87.2 per 1,000 | 5 | 98.1% |
| Merton 024A | 1,827 | 105.8 per 1,000 | 4 | 99.4% |
| Merton 024B | 1,873 | 71.9 per 1,000 | 6 | 96.0% |
| Merton 024C | 1,798 | 63.4 per 1,000 | 4 | 99.9% |
| Merton 024D | 1,943 | 38.3 per 1,000 | 8 | 98.1% |
| Merton 024E | 2,226 | 81.5 per 1,000 | 4 | 86.0% |
| Merton 025A | 1,591 | 40.1 per 1,000 | 8 | 99.8% |
| Merton 025B | 1,442 | 12.9 per 1,000 | 10 | 100.0% |
| Merton 025C | 1,824 | 35.8 per 1,000 | 7 | 90.6% |
| Merton 025D | 1,483 | 40.0 per 1,000 | 9 | 99.3% |
| Merton 025E | 1,465 | 69.0 per 1,000 | 9 | 97.7% |
| Sutton 002B | 2,007 | 58.8 per 1,000 | 4 | 100.0% |
| Sutton 002E | 1,888 | 95.9 per 1,000 | 2 | 92.9% |
MPs for SM4
- Dame Siobhain McDonaghLabourMP for Mitcham and Morden81% of SM4’s postcodes
- Mr Paul KohlerLiberal DemocratMP for Wimbledon11% of SM4’s postcodes
- Bobby DeanLiberal DemocratMP for Carshalton and Wallington8.3% of SM4’s postcodes
As of , from the UK Parliament Members API. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.
Middle areas in SM45
Postcode sectors in SM44
Council1
Towns in SM42
Postcode districts next to SM48
Nearest rail stations4
More in the SM postcode area2
SM4 in brief
SM4 is a postcode district covering Morden, Risley Close and St Helier, in Merton.
About 41,354 people lived in SM4 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £505,000 in 2025 across 341 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 66.7 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in SM4 was £505,000 in 2025.
SM4 had 40,980 usual residents at the census.
About 0% of people in SM4 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In SM4, 96.7% of homes and businesses could get gigabit-capable broadband in January 2026.