# SM4

Postcode district covering Morden, Risley Close and St Helier, in Merton.

SM4 is a postcode district covering Morden, Risley Close and St Helier, in Merton. Median sale price £505,000 in 2025. Recorded crime 66.7 per 1,000 people.

Postcode district. Code SM4. In: [Postcodes](https://openindex.co.uk/postcode) › [SM](https://openindex.co.uk/postcode/sm)

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](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £505,000** (2025). The median price paid for a home in SM4 was £505,000 in 2025. Joint 268th most expensive of 2,235. Source: Worked out by Open Index from HM Land Registry Price Paid Data. Published 28 September 2026. https://openindex.co.uk/postcode/sm4#f-house-sales-median-price
- **Population: 40,980** (2021). SM4 had 40,980 usual residents at the census (ONS Census 2021). 424th most populated of 2,756. Source: Census 2021, England and Wales and Scotland's Census 2022 and Census 2021, Northern Ireland, 2021. Published 21 July 2026. https://openindex.co.uk/postcode/sm4#f-population
- **People in radon Affected Area squares: 0%** (2022). About 0% of people in SM4 live in a 1 km square that the radon atlas marks as a radon Affected Area. UK 44%. Source: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. Published 1 December 2022. https://openindex.co.uk/postcode/sm4#f-radon-affected-share
- **Gigabit broadband coverage: 96.7%** (January 2026). In SM4, 96.7% of homes and businesses could get gigabit-capable broadband in January 2026 (Ofcom). UK 87.8%. Source: Connected Nations (Ofcom), January 2026. Published 13 May 2026. https://openindex.co.uk/postcode/sm4#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=SM4) (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.
- [Sales per year by postcode district](https://openindex.co.uk/map/house-sales-per-year?place=SM4) (Worked out by Open Index · 2025): 341 homes were sold in SM4 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime?place=SM4) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for SM4.
- [Population by postcode district](https://openindex.co.uk/map/population?place=SM4) (Census 2021, England and Wales): SM4 had 40,980 usual residents at the census.

## How SM4 compares

Each postcode district against every other postcode district the measure covers.

| Measure | SM4 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £505,000 | 3rd most expensive | 7 postcode districts, SM · 2025 |
| Population | 40,980 | 3rd most populated | 7 postcode districts, SM · 2021 |
| People in radon Affected Area squares | 0% | fewest people in radon Affected Areas | 7 postcode districts, SM · 2022 |
| Gigabit broadband coverage | 96.7% | highest | 7 postcode districts, SM · Jan 2026 |

## 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

Source: English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.

## Neighbourhoods in SM4

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Merton 021A](https://openindex.co.uk/merton/neighbourhood/e01003362) | 1,382 | 45.5 per 1,000 | 10 | 100.0% |
| [Merton 021B](https://openindex.co.uk/merton/neighbourhood/e01003363) | 1,698 | 18.0 per 1,000 | 10 | 99.2% |
| [Merton 021C](https://openindex.co.uk/merton/neighbourhood/e01003364) | 1,817 | 18.6 per 1,000 | 10 | 100.0% |
| [Merton 021D](https://openindex.co.uk/merton/neighbourhood/e01003365) | 1,486 | 24.4 per 1,000 | 10 | 100.0% |
| [Merton 021E](https://openindex.co.uk/merton/neighbourhood/e01003421) | 1,594 | 47.8 per 1,000 | 8 | 98.5% |
| [Merton 022C](https://openindex.co.uk/merton/neighbourhood/e01003437) | 2,031 | 54.5 per 1,000 | 6 | 95.6% |
| [Merton 023A](https://openindex.co.uk/merton/neighbourhood/e01003427) | 1,976 | 292.0 per 1,000 | 5 | 88.4% |
| [Merton 023B](https://openindex.co.uk/merton/neighbourhood/e01003436) | 1,742 | 59.7 per 1,000 | 5 | 99.7% |
| [Merton 023C](https://openindex.co.uk/merton/neighbourhood/e01003439) | 1,590 | 72.0 per 1,000 | 4 | 98.8% |
| [Merton 023D](https://openindex.co.uk/merton/neighbourhood/e01003448) | 2,301 | 47.8 per 1,000 | 6 | 99.3% |
| [Merton 023E](https://openindex.co.uk/merton/neighbourhood/e01003453) | 1,839 | 87.2 per 1,000 | 5 | 98.1% |
| [Merton 024A](https://openindex.co.uk/merton/neighbourhood/e01003438) | 1,827 | 105.8 per 1,000 | 4 | 99.4% |
| [Merton 024B](https://openindex.co.uk/merton/neighbourhood/e01003449) | 1,873 | 71.9 per 1,000 | 6 | 96.0% |
| [Merton 024C](https://openindex.co.uk/merton/neighbourhood/e01003450) | 1,798 | 63.4 per 1,000 | 4 | 99.9% |
| [Merton 024D](https://openindex.co.uk/merton/neighbourhood/e01003451) | 1,943 | 38.3 per 1,000 | 8 | 98.1% |
| [Merton 024E](https://openindex.co.uk/merton/neighbourhood/e01003452) | 2,226 | 81.5 per 1,000 | 4 | 86.0% |
| [Merton 025A](https://openindex.co.uk/merton/neighbourhood/e01003417) | 1,591 | 40.1 per 1,000 | 8 | 99.8% |
| [Merton 025B](https://openindex.co.uk/merton/neighbourhood/e01003418) | 1,442 | 12.9 per 1,000 | 10 | 100.0% |
| [Merton 025C](https://openindex.co.uk/merton/neighbourhood/e01003419) | 1,824 | 35.8 per 1,000 | 7 | 90.6% |
| [Merton 025D](https://openindex.co.uk/merton/neighbourhood/e01003420) | 1,483 | 40.0 per 1,000 | 9 | 99.3% |
| [Merton 025E](https://openindex.co.uk/merton/neighbourhood/e01003422) | 1,465 | 69.0 per 1,000 | 9 | 97.7% |
| [Sutton 002B](https://openindex.co.uk/sutton/neighbourhood/e01004124) | 2,007 | 58.8 per 1,000 | 4 | 100.0% |
| [Sutton 002E](https://openindex.co.uk/sutton/neighbourhood/e01004129) | 1,888 | 95.9 per 1,000 | 2 | 92.9% |

## Your MP

- [Mitcham and Morden](https://openindex.co.uk/constituency/mitcham-and-morden): Dame Siobhain McDonagh (Labour), MP since July 2024. 81% of the people here.
- [Wimbledon](https://openindex.co.uk/constituency/wimbledon): Mr Paul Kohler (Liberal Democrat), MP since July 2024. 11% of the people here.
- [Carshalton and Wallington](https://openindex.co.uk/constituency/carshalton-and-wallington): Bobby Dean (Liberal Democrat), MP since July 2024. 8.3% of the people here.

As of 18 October 2026. Contains Parliamentary information licensed under the Open Parliament Licence v3.0. Source: UK Parliament, Members API.

## Middle areas in SM4

[Cannon Hill](https://openindex.co.uk/merton/cannon-hill), [Lower Morden](https://openindex.co.uk/merton/lower-morden), [Morden Central](https://openindex.co.uk/merton/morden-central), [St Helier North](https://openindex.co.uk/merton/st-helier-north), [St Helier South](https://openindex.co.uk/sutton/st-helier-south)

## Postcode sectors in SM4

[SM4 4 (178 postcodes)](https://openindex.co.uk/postcode/sm4-4), [SM4 5 (165 postcodes)](https://openindex.co.uk/postcode/sm4-5), [SM4 6 (211 postcodes)](https://openindex.co.uk/postcode/sm4-6), [SM4 9 (27 postcodes)](https://openindex.co.uk/postcode/sm4-9)

## Council

[Merton](https://openindex.co.uk/merton)

## Towns in SM4

[Merton](https://openindex.co.uk/merton), [Sutton](https://openindex.co.uk/sutton)

## Postcode districts next to SM4

[CR4](https://openindex.co.uk/postcode/cr4), [KT3](https://openindex.co.uk/postcode/kt3), [KT4](https://openindex.co.uk/postcode/kt4), [SM1](https://openindex.co.uk/postcode/sm1), [SM3](https://openindex.co.uk/postcode/sm3), [SM5](https://openindex.co.uk/postcode/sm5), [SW19](https://openindex.co.uk/postcode/sw19), [SW20](https://openindex.co.uk/postcode/sw20)

## Nearest rail stations

[Morden South (300 m from the middle)](https://openindex.co.uk/map/rail-stations?around=-0.1995,51.3961), [St Helier (London) (500 m from the middle)](https://openindex.co.uk/map/rail-stations?around=-0.1988,51.3899), [Morden (900 m from the middle)](https://openindex.co.uk/map/rail-stations?around=-0.1948,51.4021), [South Merton (1.1 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-0.2052,51.4030)

## More in the SM postcode area

[All SM postcode districts](https://openindex.co.uk/postcode/sm), [Every UK postcode area](https://openindex.co.uk/postcode)

## 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.

## About

- Type: Postcode district
- Code: SM4
- Postcode area: [SM](https://openindex.co.uk/postcode/sm)
- Constituency: [Mitcham and Morden †](https://openindex.co.uk/constituency/mitcham-and-morden)
- Council: [Merton †](https://openindex.co.uk/merton)
- Area: 7.12 km²
- People, mid-2024: 41,354*
- Neighbourhoods: 23
- Output areas: 114

* People: worked out by Open Index from neighbourhood estimates, shared out by where people lived at the census (by area in Northern Ireland). This area's edges do not follow neighbourhood edges, so the figure is close but not exact.
† Best fit: the constituency, council, region and nation this postcode district mostly lies in. Its edges do not follow theirs.

## Next door

[SW20](https://openindex.co.uk/postcode/sw20), [CR4](https://openindex.co.uk/postcode/cr4), [SM5](https://openindex.co.uk/postcode/sm5), [SW19](https://openindex.co.uk/postcode/sw19), [SM3](https://openindex.co.uk/postcode/sm3), [KT4](https://openindex.co.uk/postcode/kt4)

## Latest updates for SM4

- August 2026 house prices published: HM Land Registry and partners · Oct 2026.
- September 2026 rent published: ONS private rents · Oct 2026.
- Dental practices updated: NHS England · Oct 2026.
- Schools updated: Ofsted · Oct 2026.

The same figures as JSON: https://openindex.co.uk/v1/places/SM4

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/sm4, or to one figure with its anchor, https://openindex.co.uk/postcode/sm4#f-house-sales-median-price.

Open Index's own text and the figures it works out are licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source data keeps its publishers' licences, named with each figure. Give each figure's period and source with it.

Snapshot 2026.10.9. The HTML page: https://openindex.co.uk/postcode/sm4