# SO21

Postcode district covering Colden Common, in Winchester.

SO21 is a postcode district covering Colden Common, in Winchester. Median sale price £576,500 in 2025. Recorded crime 44.1 per 1,000 people.

Postcode district. Code SO21. In: [Postcodes](https://openindex.co.uk/postcode) › [SO](https://openindex.co.uk/postcode/so)

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 SO21 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £576,500** (2025). The median price paid for a home in SO21 was £576,500 in 2025. 168th 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/so21#f-house-sales-median-price
- **Population: 20,980** (2021). SO21 had 20,980 usual residents at the census (ONS Census 2021). 1,356th least 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/so21#f-population
- **People in radon Affected Area squares: 48%** (2022). About 48% of people in SO21 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/so21#f-radon-affected-share
- **Gigabit broadband coverage: 42.0%** (January 2026). In SO21, 42.0% 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/so21#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=SO21) (Worked out by Open Index · 2022): About 48% of people in SO21 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=SO21) (Worked out by Open Index · 2025): 216 homes were sold in SO21 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime?place=SO21) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for SO21.
- [Population by postcode district](https://openindex.co.uk/map/population?place=SO21) (Census 2021, England and Wales): SO21 had 20,980 usual residents at the census.

## How SO21 compares

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

| Measure | SO21 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £576,500 | 3rd most expensive | 23 postcode districts, SO · 2025 |
| Population | 20,980 | 8th least populated | 24 postcode districts, SO · 2021 |
| People in radon Affected Area squares | 48% | 9th most people in radon Affected Areas | 24 postcode districts, SO · 2022 |
| Gigabit broadband coverage | 42.0% | lowest | 24 postcode districts, SO · Jan 2026 |

## Is SO21 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in SO21 at a rate of 44.1 per 1,000 people.
That compares with 86.0 per 1,000 people across the SO postcode area.
In August 2026 alone, 131 cases of crime and anti-social behaviour were recorded in SO21.
In the 12 months to August 2026, the most common types were other crime (301), violence and sexual offences (289) and criminal damage and arson (85).
A year earlier, the recorded crime rate in SO21 was 45.5 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 SO21, neighbourhood by neighbourhood

- Deprivation is ranked by neighbourhood, so SO21 has no single figure. Of its 11 neighbourhoods with a rank:
- Decile 4: 1 neighbourhood
- Decile 6: 1 neighbourhood
- Decile 7: 2 neighbourhoods
- Decile 8: 2 neighbourhoods
- Decile 9: 2 neighbourhoods
- Decile 10 (England’s least deprived 10%): 3 neighbourhoods

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

## Neighbourhoods in SO21

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Winchester 001A](https://openindex.co.uk/winchester/neighbourhood/e01023286) | 1,513 | 69.1 per 1,000 | 6 | 0.1% |
| [Winchester 001B](https://openindex.co.uk/winchester/neighbourhood/e01023287) | 2,962 | 21.1 per 1,000 | 10 | 13.5% |
| [Winchester 001C](https://openindex.co.uk/winchester/neighbourhood/e01023288) | 1,443 | 66.3 per 1,000 | 4 | 7.2% |
| [Winchester 002A](https://openindex.co.uk/winchester/neighbourhood/e01023236) | 2,019 | 98.9 per 1,000 | 7 | 29.2% |
| [Winchester 003E](https://openindex.co.uk/winchester/neighbourhood/e01023274) | 2,665 | 64.3 per 1,000 | 8 | 52.4% |
| [Winchester 009A](https://openindex.co.uk/winchester/neighbourhood/e01023229) | 2,091 | 43.3 per 1,000 | 9 | 60.2% |
| [Winchester 010A](https://openindex.co.uk/winchester/neighbourhood/e01023226) | 1,691 | 34.9 per 1,000 | 10 | 54.1% |
| [Winchester 010B](https://openindex.co.uk/winchester/neighbourhood/e01023227) | 2,022 | 50.9 per 1,000 | 8 | 72.9% |
| [Winchester 010C](https://openindex.co.uk/winchester/neighbourhood/e01023228) | 2,279 | 31.5 per 1,000 | 9 | 70.4% |
| [Winchester 010D](https://openindex.co.uk/winchester/neighbourhood/e01023230) | 2,129 | 31.3 per 1,000 | 10 | 67.2% |
| [Winchester 010E](https://openindex.co.uk/winchester/neighbourhood/e01023246) | 1,628 | 44.2 per 1,000 | 7 | 66.3% |

## Your MP

- [Winchester](https://openindex.co.uk/constituency/winchester): Dr Danny Chambers (Liberal Democrat), MP since July 2024. 93% of the people here.
- [Romsey and Southampton North](https://openindex.co.uk/constituency/romsey-and-southampton-north): Caroline Nokes (Conservative), MP since July 2024. 5.8% of the people here.
- [East Hampshire](https://openindex.co.uk/constituency/east-hampshire): Damian Hinds (Conservative), MP since July 2024. 0.7% of the people here.
- [Eastleigh](https://openindex.co.uk/constituency/eastleigh): Liz Jarvis (Liberal Democrat), MP since July 2024. 0.1% of the people here.
- [North West Hampshire](https://openindex.co.uk/constituency/north-west-hampshire): Kit Malthouse (Conservative), MP since July 2024. 0.1% of the people here.
- [Basingstoke](https://openindex.co.uk/constituency/basingstoke): Luke Murphy (Labour), MP since July 2024. 0.1% 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 SO21

[Colden Common & Twyford](https://openindex.co.uk/winchester/colden-common-and-twyford), [South Wonston, Sutton Scotney & Micheldever](https://openindex.co.uk/winchester/south-wonston-sutton-scotney-and-micheldever)

## Postcode sectors in SO21

[SO21 1 (299 postcodes)](https://openindex.co.uk/postcode/so21-1), [SO21 2 (201 postcodes)](https://openindex.co.uk/postcode/so21-2), [SO21 3 (243 postcodes)](https://openindex.co.uk/postcode/so21-3)

## Council

[Winchester](https://openindex.co.uk/winchester)

## Postcode districts next to SO21

[RG25](https://openindex.co.uk/postcode/rg25), [RG28](https://openindex.co.uk/postcode/rg28), [SO20](https://openindex.co.uk/postcode/so20), [SO22](https://openindex.co.uk/postcode/so22), [SO23](https://openindex.co.uk/postcode/so23), [SO24](https://openindex.co.uk/postcode/so24), [SO32](https://openindex.co.uk/postcode/so32), [SO50](https://openindex.co.uk/postcode/so50), [SO51](https://openindex.co.uk/postcode/so51), [SO53](https://openindex.co.uk/postcode/so53), [SP11](https://openindex.co.uk/postcode/sp11)

## Nearest rail stations

[Micheldever (4.4 km from the middle)](https://openindex.co.uk/map/rail-stations?around=-1.2607,51.1824)

## More in the SO postcode area

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

## SO21 in brief

SO21 is a postcode district covering Colden Common, in Winchester.
About 21,926 people lived in SO21 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £576,500 in 2025 across 216 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 44.1 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in SO21 was £576,500 in 2025.
SO21 had 20,980 usual residents at the census.
About 48% of people in SO21 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In SO21, 42.0% of homes and businesses could get gigabit-capable broadband in January 2026.

## About

- Type: Postcode district
- Code: SO21
- Postcode area: [SO](https://openindex.co.uk/postcode/so)
- Constituency: [Winchester †](https://openindex.co.uk/constituency/winchester)
- Council: [Winchester †](https://openindex.co.uk/winchester)
- Area: 272 km²
- People, mid-2024: 21,926*
- Neighbourhoods: 11
- Output areas: 63

* 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

[SO24](https://openindex.co.uk/postcode/so24), [SO50](https://openindex.co.uk/postcode/so50), [SO20](https://openindex.co.uk/postcode/so20), [SO22](https://openindex.co.uk/postcode/so22), [SO23](https://openindex.co.uk/postcode/so23), [SO51](https://openindex.co.uk/postcode/so51)

## Latest updates for SO21

- 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/SO21

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/so21, or to one figure with its anchor, https://openindex.co.uk/postcode/so21#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/so21