# SN3

Postcode district covering Swindon and Stratton St Margaret, in Swindon.

SN3 is a postcode district covering Swindon and Stratton St Margaret, in Swindon. Median sale price £290,000 in 2025. Recorded crime 75.1 per 1,000 people.

Postcode district. Code SN3. In: [Postcodes](https://openindex.co.uk/postcode) › [SN](https://openindex.co.uk/postcode/sn)

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 SN3 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £290,000** (2025). The median price paid for a home in SN3 was £290,000 in 2025. Joint 1,065th cheapest 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/sn3#f-house-sales-median-price
- **Population: 54,152** (2021). SN3 had 54,152 usual residents at the census (ONS Census 2021). 143rd 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/sn3#f-population
- **People in radon Affected Area squares: 9%** (2022). About 9% of people in SN3 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/sn3#f-radon-affected-share
- **Gigabit broadband coverage: 97.6%** (January 2026). In SN3, 97.6% 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/sn3#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=SN3) (Worked out by Open Index · 2022): About 9% of people in SN3 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=SN3) (Worked out by Open Index · 2025): 891 homes were sold in SN3 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime?place=SN3) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for SN3.
- [Population by postcode district](https://openindex.co.uk/map/population?place=SN3) (Census 2021, England and Wales): SN3 had 54,152 usual residents at the census.

## How SN3 compares

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

| Measure | SN3 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £290,000 | joint 4th cheapest | 18 postcode districts, SN · 2025 |
| Population | 54,152 | most populated | 19 postcode districts, SN · 2021 |
| People in radon Affected Area squares | 9% | 5th fewest people in radon Affected Areas | 19 postcode districts, SN · 2022 |
| Gigabit broadband coverage | 97.6% | 3rd highest | 19 postcode districts, SN · Jan 2026 |

## Is SN3 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in SN3 at a rate of 75.1 per 1,000 people.
That compares with 66.2 per 1,000 people across the SN postcode area.
In August 2026 alone, 369 cases of crime and anti-social behaviour were recorded in SN3.
In the 12 months to August 2026, the most common types were violence and sexual offences (1,803), anti-social behaviour (784) and other crime (727).
A year earlier, the recorded crime rate in SN3 was 78.2 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 SN3, neighbourhood by neighbourhood

- Deprivation is ranked by neighbourhood, so SN3 has no single figure. Of its 33 neighbourhoods with a rank:
- Decile 1 (England’s most deprived 10%): 4 neighbourhoods
- Decile 2: 4 neighbourhoods
- Decile 3: 4 neighbourhoods
- Decile 6: 1 neighbourhood
- Decile 7: 6 neighbourhoods
- Decile 8: 6 neighbourhoods
- Decile 9: 7 neighbourhoods
- Decile 10 (England’s least deprived 10%): 1 neighbourhood

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

## Neighbourhoods in SN3

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Swindon 008A](https://openindex.co.uk/swindon/neighbourhood/e01015473) | 1,930 | 145.2 per 1,000 | 7 | 81.5% |
| [Swindon 009A](https://openindex.co.uk/swindon/neighbourhood/e01015549) | 1,638 | 109.0 per 1,000 | 8 | 98.4% |
| [Swindon 009B](https://openindex.co.uk/swindon/neighbourhood/e01015550) | 1,854 | 65.1 per 1,000 | 7 | 99.9% |
| [Swindon 009C](https://openindex.co.uk/swindon/neighbourhood/e01015551) | 1,654 | 50.5 per 1,000 | 9 | 99.9% |
| [Swindon 009D](https://openindex.co.uk/swindon/neighbourhood/e01015552) | 2,224 | 53.4 per 1,000 | 7 | 96.5% |
| [Swindon 009E](https://openindex.co.uk/swindon/neighbourhood/e01015553) | 1,516 | 36.9 per 1,000 | 8 | 100.0% |
| [Swindon 009F](https://openindex.co.uk/swindon/neighbourhood/e01015554) | 1,385 | 47.4 per 1,000 | 6 | 99.7% |
| [Swindon 013A](https://openindex.co.uk/swindon/neighbourhood/e01015481) | 1,761 | 56.1 per 1,000 | 8 | 93.1% |
| [Swindon 013B](https://openindex.co.uk/swindon/neighbourhood/e01015482) | 1,230 | 34.6 per 1,000 | 9 | 100.0% |
| [Swindon 013C](https://openindex.co.uk/swindon/neighbourhood/e01015483) | 1,355 | 18.3 per 1,000 | 9 | 98.8% |
| [Swindon 013D](https://openindex.co.uk/swindon/neighbourhood/e01015484) | 1,415 | 37.6 per 1,000 | 9 | 100.0% |
| [Swindon 013E](https://openindex.co.uk/swindon/neighbourhood/e01015485) | 1,386 | 48.5 per 1,000 | 9 | 100.0% |
| [Swindon 013F](https://openindex.co.uk/swindon/neighbourhood/e01015486) | 1,383 | 38.1 per 1,000 | 7 | 100.0% |
| [Swindon 016A](https://openindex.co.uk/swindon/neighbourhood/e01015538) | 1,945 | 102.8 per 1,000 | 1 | 97.2% |
| [Swindon 016B](https://openindex.co.uk/swindon/neighbourhood/e01015572) | 1,385 | 114.5 per 1,000 | 2 | 100.0% |
| [Swindon 016C](https://openindex.co.uk/swindon/neighbourhood/e01015573) | 2,293 | 188.3 per 1,000 | 1 | 96.0% |
| [Swindon 016D](https://openindex.co.uk/swindon/neighbourhood/e01015575) | 1,388 | 117.1 per 1,000 | 1 | 100.0% |
| [Swindon 017C](https://openindex.co.uk/swindon/neighbourhood/e01015574) | 1,628 | 85.9 per 1,000 | 7 | 99.1% |
| [Swindon 017D](https://openindex.co.uk/swindon/neighbourhood/e01015576) | 1,593 | 74.4 per 1,000 | 8 | 100.0% |
| [Swindon 020A](https://openindex.co.uk/swindon/neighbourhood/e01015537) | 1,800 | 59.7 per 1,000 | 2 | 100.0% |
| [Swindon 020B](https://openindex.co.uk/swindon/neighbourhood/e01015539) | 1,662 | 55.7 per 1,000 | 3 | 100.0% |
| [Swindon 020C](https://openindex.co.uk/swindon/neighbourhood/e01015540) | 1,858 | 136.5 per 1,000 | 2 | 100.0% |
| [Swindon 020D](https://openindex.co.uk/swindon/neighbourhood/e01015541) | 1,814 | 119.9 per 1,000 | 2 | 99.4% |
| [Swindon 020E](https://openindex.co.uk/swindon/neighbourhood/e01015542) | 1,415 | 148.4 per 1,000 | 1 | 100.0% |
| [Swindon 023A](https://openindex.co.uk/swindon/neighbourhood/e01015487) | 1,483 | 22.0 per 1,000 | 9 | 100.0% |
| [Swindon 023B](https://openindex.co.uk/swindon/neighbourhood/e01015488) | 1,462 | 74.9 per 1,000 | 3 | 100.0% |
| [Swindon 023C](https://openindex.co.uk/swindon/neighbourhood/e01015489) | 1,433 | 28.2 per 1,000 | 8 | 100.0% |
| [Swindon 023D](https://openindex.co.uk/swindon/neighbourhood/e01015490) | 1,264 | 25.6 per 1,000 | 7 | 100.0% |
| [Swindon 023E](https://openindex.co.uk/swindon/neighbourhood/e01015491) | 1,417 | 132.6 per 1,000 | 3 | 99.7% |
| [Swindon 023F](https://openindex.co.uk/swindon/neighbourhood/e01015492) | 1,402 | 57.4 per 1,000 | 3 | 100.0% |
| [Swindon 024A](https://openindex.co.uk/swindon/neighbourhood/e01015533) | 1,487 | 26.1 per 1,000 | 10 | 95.3% |
| [Swindon 024C](https://openindex.co.uk/swindon/neighbourhood/e01015535) | 2,089 | 58.1 per 1,000 | 9 | 82.2% |
| [Swindon 025G](https://openindex.co.uk/swindon/neighbourhood/e01033849) | 2,218 | 43.1 per 1,000 | 8 | 97.9% |

## Your MP

- [Swindon South](https://openindex.co.uk/constituency/swindon-south): Heidi Alexander (Labour), MP since July 2024. 73% of the people here.
- [Swindon North](https://openindex.co.uk/constituency/swindon-north): Will Stone (Labour), MP since July 2024. 25% of the people here.
- [East Wiltshire](https://openindex.co.uk/constituency/east-wiltshire): Danny Kruger (Reform UK), MP since July 2024. 2.4% 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 SN3

[Covingham](https://openindex.co.uk/swindon/covingham), [Eldene & Dorcan](https://openindex.co.uk/swindon/eldene-and-dorcan), [Lower Stratton](https://openindex.co.uk/swindon/lower-stratton), [Park North & Park South](https://openindex.co.uk/swindon/park-north-and-park-south), [Walcot East](https://openindex.co.uk/swindon/walcot-east)

## Postcode sectors in SN3

[SN3 0 (20 postcodes)](https://openindex.co.uk/postcode/sn3-0), [SN3 1 (212 postcodes)](https://openindex.co.uk/postcode/sn3-1), [SN3 2 (223 postcodes)](https://openindex.co.uk/postcode/sn3-2), [SN3 3 (227 postcodes)](https://openindex.co.uk/postcode/sn3-3), [SN3 4 (332 postcodes)](https://openindex.co.uk/postcode/sn3-4), [SN3 5 (112 postcodes)](https://openindex.co.uk/postcode/sn3-5), [SN3 6 (162 postcodes)](https://openindex.co.uk/postcode/sn3-6), [SN3 9 (22 postcodes)](https://openindex.co.uk/postcode/sn3-9)

## Council

[Swindon](https://openindex.co.uk/swindon)

## Towns in SN3

[Stratton St Margaret](https://openindex.co.uk/town/stratton-st-margaret), [Swindon](https://openindex.co.uk/town/swindon)

## Postcode districts next to SN3

[SN1](https://openindex.co.uk/postcode/sn1), [SN2](https://openindex.co.uk/postcode/sn2), [SN4](https://openindex.co.uk/postcode/sn4), [SN6](https://openindex.co.uk/postcode/sn6), [SN25](https://openindex.co.uk/postcode/sn25), [SN38](https://openindex.co.uk/postcode/sn38)

## Nearest rail stations

[Swindon (Wilts) (4.6 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-1.7855,51.5655)

## More in the SN postcode area

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

## SN3 in brief

SN3 is a postcode district covering Swindon and Stratton St Margaret, in Swindon.
About 56,822 people lived in SN3 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £290,000 in 2025 across 891 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 75.1 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in SN3 was £290,000 in 2025.
SN3 had 54,152 usual residents at the census.
About 9% of people in SN3 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In SN3, 97.6% of homes and businesses could get gigabit-capable broadband in January 2026.

## About

- Type: Postcode district
- Code: SN3
- Postcode area: [SN](https://openindex.co.uk/postcode/sn)
- Constituency: [Swindon South †](https://openindex.co.uk/constituency/swindon-south)
- Council: [Swindon †](https://openindex.co.uk/swindon)
- Area: 31.00 km²
- People, mid-2024: 56,822*
- Neighbourhoods: 33
- Output areas: 177

* 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

[SN4](https://openindex.co.uk/postcode/sn4), [SN6](https://openindex.co.uk/postcode/sn6), [SN1](https://openindex.co.uk/postcode/sn1), [SN2](https://openindex.co.uk/postcode/sn2), [SN25](https://openindex.co.uk/postcode/sn25), [SN38](https://openindex.co.uk/postcode/sn38)

## Latest updates for SN3

- 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/SN3

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/sn3, or to one figure with its anchor, https://openindex.co.uk/postcode/sn3#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/sn3