# CM1

Postcode district covering Chelmsford, Springfield and Broomfield, in Chelmsford.

CM1 is a postcode district covering Chelmsford, Springfield and Broomfield, in Chelmsford. Median sale price £400,000 in 2025.

Postcode district. Code CM1. In: [Postcodes](https://openindex.co.uk/postcode) › [CM](https://openindex.co.uk/postcode/cm)

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 CM1 postcode. [How census figures are added up](https://openindex.co.uk/sources/population)

## Key figures

- **Median sale price: £400,000** (2025). The median price paid for a home in CM1 was £400,000 in 2025. Joint 587th 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/cm1#f-house-sales-median-price
- **Population: 69,073** (2021). CM1 had 69,073 usual residents at the census (ONS Census 2021). 47th 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/cm1#f-population
- **People in radon Affected Area squares: 0%** (2022). About 0% of people in CM1 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/cm1#f-radon-affected-share
- **Gigabit broadband coverage: 94.2%** (January 2026). In CM1, 94.2% 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/cm1#f-gigabit-coverage

## On the map

- [Radon Affected Area by postcode district](https://openindex.co.uk/map/radon-affected-areas?place=CM1) (Worked out by Open Index · 2022): About 0% of people in CM1 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=CM1) (Worked out by Open Index · 2025): 1,059 homes were sold in CM1 in 2025.
- [Crime and ASB by postcode district](https://openindex.co.uk/map/recorded-crime?place=CM1) (Police recorded crime and outcomes (data.police.uk) · August 2026): Crime and anti-social behaviour for CM1.
- [Population by postcode district](https://openindex.co.uk/map/population?place=CM1) (Census 2021, England and Wales): CM1 had 69,073 usual residents at the census.

## How CM1 compares

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

| Measure | CM1 | Rank | Compared with |
| --- | --- | --- | --- |
| Median sale price | £400,000 | 10th cheapest | 25 postcode districts, CM · 2025 |
| Population | 69,073 | most populated | 27 postcode districts, CM · 2021 |
| People in radon Affected Area squares | 0% | joint fewest people in radon Affected Areas | 27 postcode districts, CM · 2022 |
| Gigabit broadband coverage | 94.2% | 3rd highest | 27 postcode districts, CM · Jan 2026 |

## Is CM1 safe? What police records show

In the 12 months to August 2026, police recorded crimes and anti-social behaviour in CM1 at a rate of 104.2 per 1,000 people.
That compares with 77.3 per 1,000 people across the CM postcode area.
In August 2026 alone, 726 cases of crime and anti-social behaviour were recorded in CM1.
In the 12 months to August 2026, the most common types were violence and sexual offences (3,218), other crime (1,295) and anti-social behaviour (804).
A year earlier, the recorded crime rate in CM1 was 95.3 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 CM1, neighbourhood by neighbourhood

- Deprivation is ranked by neighbourhood, so CM1 has no single figure. Of its 45 neighbourhoods with a rank:
- Decile 2: 4 neighbourhoods
- Decile 3: 5 neighbourhoods
- Decile 5: 5 neighbourhoods
- Decile 6: 6 neighbourhoods
- Decile 7: 7 neighbourhoods
- Decile 8: 2 neighbourhoods
- Decile 9: 7 neighbourhoods
- Decile 10 (England’s least deprived 10%): 9 neighbourhoods

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

## Neighbourhoods in CM1

| Area | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
| --- | --- | --- | --- | --- |
| [Chelmsford 001E](https://openindex.co.uk/chelmsford/neighbourhood/e01034081) | 1,642 | 59.6 per 1,000 | 6 | 93.5% |
| [Chelmsford 001F](https://openindex.co.uk/chelmsford/neighbourhood/e01034082) | 1,685 | 90.2 per 1,000 | 6 | 97.9% |
| [Chelmsford 002A](https://openindex.co.uk/chelmsford/neighbourhood/e01021542) | 2,404 | 167.9 per 1,000 | 7 | 94.3% |
| [Chelmsford 002B](https://openindex.co.uk/chelmsford/neighbourhood/e01021543) | 1,741 | 43.9 per 1,000 | 9 | 99.9% |
| [Chelmsford 002C](https://openindex.co.uk/chelmsford/neighbourhood/e01021587) | 1,465 | 70.5 per 1,000 | 10 | 100.0% |
| [Chelmsford 002D](https://openindex.co.uk/chelmsford/neighbourhood/e01021590) | 1,404 | 35.3 per 1,000 | 10 | 97.5% |
| [Chelmsford 002E](https://openindex.co.uk/chelmsford/neighbourhood/e01021591) | 1,616 | 25.3 per 1,000 | 10 | 100.0% |
| [Chelmsford 003A](https://openindex.co.uk/chelmsford/neighbourhood/e01021550) | 1,785 | 57.3 per 1,000 | 6 | 83.8% |
| [Chelmsford 003B](https://openindex.co.uk/chelmsford/neighbourhood/e01021597) | 1,562 | 84.2 per 1,000 | 5 | 98.9% |
| [Chelmsford 003C](https://openindex.co.uk/chelmsford/neighbourhood/e01021598) | 1,613 | 65.7 per 1,000 | 3 | 99.6% |
| [Chelmsford 003D](https://openindex.co.uk/chelmsford/neighbourhood/e01021600) | 1,142 | 15.3 per 1,000 | 10 | 96.8% |
| [Chelmsford 003E](https://openindex.co.uk/chelmsford/neighbourhood/e01021601) | 1,524 | 136.5 per 1,000 | 2 | 95.8% |
| [Chelmsford 004B](https://openindex.co.uk/chelmsford/neighbourhood/e01021617) | 1,316 | 97.6 per 1,000 | 5 | 87.3% |
| [Chelmsford 004C](https://openindex.co.uk/chelmsford/neighbourhood/e01021619) | 1,428 | 23.2 per 1,000 | 9 | 86.3% |
| [Chelmsford 004D](https://openindex.co.uk/chelmsford/neighbourhood/e01021620) | 1,465 | 35.9 per 1,000 | 7 | 79.2% |
| [Chelmsford 004E](https://openindex.co.uk/chelmsford/neighbourhood/e01021623) | 1,240 | 20.8 per 1,000 | 9 | 95.0% |
| [Chelmsford 004F](https://openindex.co.uk/chelmsford/neighbourhood/e01021624) | 1,226 | 35.6 per 1,000 | 10 | 96.6% |
| [Chelmsford 004G](https://openindex.co.uk/chelmsford/neighbourhood/e01034083) | 1,517 | 116.8 per 1,000 | 7 | 99.9% |
| [Chelmsford 004H](https://openindex.co.uk/chelmsford/neighbourhood/e01034084) | 1,804 | 17.3 per 1,000 | 10 | 94.1% |
| [Chelmsford 005F](https://openindex.co.uk/chelmsford/neighbourhood/e01033144) | 1,779 | 62.2 per 1,000 | 9 | 96.2% |
| [Chelmsford 006A](https://openindex.co.uk/chelmsford/neighbourhood/e01021576) | 1,710 | 110.9 per 1,000 | 2 | 97.6% |
| [Chelmsford 006B](https://openindex.co.uk/chelmsford/neighbourhood/e01021588) | 1,376 | 118.3 per 1,000 | 3 | 93.1% |
| [Chelmsford 006C](https://openindex.co.uk/chelmsford/neighbourhood/e01021589) | 1,577 | 70.9 per 1,000 | 7 | 78.3% |
| [Chelmsford 006D](https://openindex.co.uk/chelmsford/neighbourhood/e01021592) | 1,633 | 120.3 per 1,000 | 3 | 97.6% |
| [Chelmsford 006E](https://openindex.co.uk/chelmsford/neighbourhood/e01021596) | 1,611 | 125.4 per 1,000 | 2 | 100.0% |
| [Chelmsford 007A](https://openindex.co.uk/chelmsford/neighbourhood/e01021618) | 1,431 | 28.6 per 1,000 | 9 | 98.8% |
| [Chelmsford 007B](https://openindex.co.uk/chelmsford/neighbourhood/e01021621) | 1,579 | 29.9 per 1,000 | 7 | 97.4% |
| [Chelmsford 007C](https://openindex.co.uk/chelmsford/neighbourhood/e01021622) | 1,523 | 45.4 per 1,000 | 10 | 98.6% |
| [Chelmsford 007D](https://openindex.co.uk/chelmsford/neighbourhood/e01021625) | 1,448 | 30.0 per 1,000 | 10 | 98.9% |
| [Chelmsford 009A](https://openindex.co.uk/chelmsford/neighbourhood/e01021573) | 1,778 | 155.3 per 1,000 | 7 | 99.6% |
| [Chelmsford 009B](https://openindex.co.uk/chelmsford/neighbourhood/e01021575) | 1,700 | 69.4 per 1,000 | 5 | 94.2% |
| [Chelmsford 009C](https://openindex.co.uk/chelmsford/neighbourhood/e01021599) | 1,837 | 72.8 per 1,000 | 9 | 92.6% |
| [Chelmsford 009E](https://openindex.co.uk/chelmsford/neighbourhood/e01021631) | 1,920 | 89.9 per 1,000 | 3 | 100.0% |
| [Chelmsford 009F](https://openindex.co.uk/chelmsford/neighbourhood/e01033138) | 1,474 | 216.2 per 1,000 | 8 | 94.3% |
| [Chelmsford 009G](https://openindex.co.uk/chelmsford/neighbourhood/e01033139) | 1,640 | 55.4 per 1,000 | 6 | 95.4% |
| [Chelmsford 011A](https://openindex.co.uk/chelmsford/neighbourhood/e01021551) | 1,416 | 47.5 per 1,000 | 5 | 97.7% |
| [Chelmsford 011B](https://openindex.co.uk/chelmsford/neighbourhood/e01021632) | 1,566 | 38.7 per 1,000 | 9 | 98.7% |
| [Chelmsford 011C](https://openindex.co.uk/chelmsford/neighbourhood/e01021633) | 1,338 | 86.1 per 1,000 | 10 | 82.5% |
| [Chelmsford 011D](https://openindex.co.uk/chelmsford/neighbourhood/e01021634) | 1,465 | 68.3 per 1,000 | 8 | 85.7% |
| [Chelmsford 011E](https://openindex.co.uk/chelmsford/neighbourhood/e01021635) | 1,387 | 26.1 per 1,000 | 6 | 96.9% |
| [Chelmsford 011F](https://openindex.co.uk/chelmsford/neighbourhood/e01021636) | 1,138 | 68.9 per 1,000 | 3 | 99.6% |
| [Chelmsford 022A](https://openindex.co.uk/chelmsford/neighbourhood/e01034089) | 2,305 | 90.7 per 1,000 | 7 | 91.9% |
| [Chelmsford 022B](https://openindex.co.uk/chelmsford/neighbourhood/e01021627) | 1,590 | 162.7 per 1,000 | 6 | 99.7% |
| [Chelmsford 023A](https://openindex.co.uk/chelmsford/neighbourhood/e01034091) | 1,269 | 312.2 per 1,000 | 5 | 88.2% |
| [Chelmsford 023B](https://openindex.co.uk/chelmsford/neighbourhood/e01034092) | 1,243 | 768.2 per 1,000 | 2 | 82.3% |

## Your MP

- [Chelmsford](https://openindex.co.uk/constituency/chelmsford): Marie Goldman (Liberal Democrat), MP since July 2024. 69% of the people here.
- [North West Essex](https://openindex.co.uk/constituency/north-west-essex): Mrs Kemi Badenoch (Conservative), MP since July 2024. 31% of the people here.
- [Maldon](https://openindex.co.uk/constituency/maldon): Sir John Whittingdale (Conservative), 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 CM1

[Central Chelmsford East](https://openindex.co.uk/chelmsford/central-chelmsford-east), [Central Chelmsford West](https://openindex.co.uk/chelmsford/central-chelmsford-west), [Melbourne](https://openindex.co.uk/chelmsford/melbourne), [Melbourne Park, Chignall & Pleshey](https://openindex.co.uk/chelmsford/melbourne-park-chignall-and-pleshey), [South Broomfield](https://openindex.co.uk/chelmsford/south-broomfield), [Springfield North](https://openindex.co.uk/chelmsford/springfield-north), [Springfield South & Coronation Park](https://openindex.co.uk/chelmsford/springfield-south-and-coronation-park), [Waterhouse Lane & Admirals Park](https://openindex.co.uk/chelmsford/waterhouse-lane-and-admirals-park), [Writtle & Highwood](https://openindex.co.uk/chelmsford/writtle-and-highwood)

## Postcode sectors in CM1

[CM1 1 (208 postcodes)](https://openindex.co.uk/postcode/cm1-1), [CM1 2 (253 postcodes)](https://openindex.co.uk/postcode/cm1-2), [CM1 3 (225 postcodes)](https://openindex.co.uk/postcode/cm1-3), [CM1 4 (313 postcodes)](https://openindex.co.uk/postcode/cm1-4), [CM1 6 (274 postcodes)](https://openindex.co.uk/postcode/cm1-6), [CM1 7 (208 postcodes)](https://openindex.co.uk/postcode/cm1-7), [CM1 9 (80 postcodes)](https://openindex.co.uk/postcode/cm1-9)

## Council

[Chelmsford](https://openindex.co.uk/chelmsford)

## Towns in CM1

[Chelmsford](https://openindex.co.uk/town/chelmsford)

## Postcode districts next to CM1

[CM2](https://openindex.co.uk/postcode/cm2), [CM3](https://openindex.co.uk/postcode/cm3), [CM4](https://openindex.co.uk/postcode/cm4), [CM5](https://openindex.co.uk/postcode/cm5), [CM6](https://openindex.co.uk/postcode/cm6), [CM98](https://openindex.co.uk/postcode/cm98), [CM99](https://openindex.co.uk/postcode/cm99)

## Nearest rail stations

[Chelmsford (5.0 km from the middle)](https://openindex.co.uk/map/rail-stations?around=0.4686,51.7364)

## More in the CM postcode area

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

## CM1 in brief

CM1 is a postcode district covering Chelmsford, Springfield and Broomfield, in Chelmsford.
About 72,908 people lived in CM1 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £400,000 in 2025 across 1,059 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 104.2 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in CM1 was £400,000 in 2025.
CM1 had 69,073 usual residents at the census.
About 0% of people in CM1 live in a 1 km square that the radon atlas marks as a radon Affected Area.
In CM1, 94.2% of homes and businesses could get gigabit-capable broadband in January 2026.

## About

- Type: Postcode district
- Code: CM1
- Postcode area: [CM](https://openindex.co.uk/postcode/cm)
- Constituency: [Chelmsford †](https://openindex.co.uk/constituency/chelmsford)
- Council: [Chelmsford †](https://openindex.co.uk/chelmsford)
- Area: 98.06 km²
- People, mid-2024: 72,908*
- Neighbourhoods: 45
- Output areas: 222

* 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

[CM3](https://openindex.co.uk/postcode/cm3), [CM4](https://openindex.co.uk/postcode/cm4), [CM6](https://openindex.co.uk/postcode/cm6), [CM2](https://openindex.co.uk/postcode/cm2), [CM5](https://openindex.co.uk/postcode/cm5), [CM98](https://openindex.co.uk/postcode/cm98)

## Latest updates for CM1

- 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/CM1

## How to cite

Source: Open Index, openindex.co.uk. Link to this page, https://openindex.co.uk/postcode/cm1, or to one figure with its anchor, https://openindex.co.uk/postcode/cm1#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/cm1