CM1
Postcode districtPostcode district covering Chelmsford, Springfield and Broomfield, in Chelmsford.
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
Radon Affected Area by postcode district
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.
How CM1 compares
Each dot is a postcode district. The black line marks the middle one.
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
English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.
Neighbourhoods in CM1
| Name | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
|---|---|---|---|---|
| Chelmsford 001E | 1,642 | 59.6 per 1,000 | 6 | 93.5% |
| Chelmsford 001F | 1,685 | 90.2 per 1,000 | 6 | 97.9% |
| Chelmsford 002A | 2,404 | 167.9 per 1,000 | 7 | 94.3% |
| Chelmsford 002B | 1,741 | 43.9 per 1,000 | 9 | 99.9% |
| Chelmsford 002C | 1,465 | 70.5 per 1,000 | 10 | 100.0% |
| Chelmsford 002D | 1,404 | 35.3 per 1,000 | 10 | 97.5% |
| Chelmsford 002E | 1,616 | 25.3 per 1,000 | 10 | 100.0% |
| Chelmsford 003A | 1,785 | 57.3 per 1,000 | 6 | 83.8% |
| Chelmsford 003B | 1,562 | 84.2 per 1,000 | 5 | 98.9% |
| Chelmsford 003C | 1,613 | 65.7 per 1,000 | 3 | 99.6% |
| Chelmsford 003D | 1,142 | 15.3 per 1,000 | 10 | 96.8% |
| Chelmsford 003E | 1,524 | 136.5 per 1,000 | 2 | 95.8% |
| Chelmsford 004B | 1,316 | 97.6 per 1,000 | 5 | 87.3% |
| Chelmsford 004C | 1,428 | 23.2 per 1,000 | 9 | 86.3% |
| Chelmsford 004D | 1,465 | 35.9 per 1,000 | 7 | 79.2% |
| Chelmsford 004E | 1,240 | 20.8 per 1,000 | 9 | 95.0% |
| Chelmsford 004F | 1,226 | 35.6 per 1,000 | 10 | 96.6% |
| Chelmsford 004G | 1,517 | 116.8 per 1,000 | 7 | 99.9% |
| Chelmsford 004H | 1,804 | 17.3 per 1,000 | 10 | 94.1% |
| Chelmsford 005F | 1,779 | 62.2 per 1,000 | 9 | 96.2% |
| Chelmsford 006A | 1,710 | 110.9 per 1,000 | 2 | 97.6% |
| Chelmsford 006B | 1,376 | 118.3 per 1,000 | 3 | 93.1% |
| Chelmsford 006C | 1,577 | 70.9 per 1,000 | 7 | 78.3% |
| Chelmsford 006D | 1,633 | 120.3 per 1,000 | 3 | 97.6% |
| Chelmsford 006E | 1,611 | 125.4 per 1,000 | 2 | 100.0% |
| Chelmsford 007A | 1,431 | 28.6 per 1,000 | 9 | 98.8% |
| Chelmsford 007B | 1,579 | 29.9 per 1,000 | 7 | 97.4% |
| Chelmsford 007C | 1,523 | 45.4 per 1,000 | 10 | 98.6% |
| Chelmsford 007D | 1,448 | 30.0 per 1,000 | 10 | 98.9% |
| Chelmsford 009A | 1,778 | 155.3 per 1,000 | 7 | 99.6% |
| Chelmsford 009B | 1,700 | 69.4 per 1,000 | 5 | 94.2% |
| Chelmsford 009C | 1,837 | 72.8 per 1,000 | 9 | 92.6% |
| Chelmsford 009E | 1,920 | 89.9 per 1,000 | 3 | 100.0% |
| Chelmsford 009F | 1,474 | 216.2 per 1,000 | 8 | 94.3% |
| Chelmsford 009G | 1,640 | 55.4 per 1,000 | 6 | 95.4% |
| Chelmsford 011A | 1,416 | 47.5 per 1,000 | 5 | 97.7% |
| Chelmsford 011B | 1,566 | 38.7 per 1,000 | 9 | 98.7% |
| Chelmsford 011C | 1,338 | 86.1 per 1,000 | 10 | 82.5% |
| Chelmsford 011D | 1,465 | 68.3 per 1,000 | 8 | 85.7% |
| Chelmsford 011E | 1,387 | 26.1 per 1,000 | 6 | 96.9% |
| Chelmsford 011F | 1,138 | 68.9 per 1,000 | 3 | 99.6% |
| Chelmsford 022A | 2,305 | 90.7 per 1,000 | 7 | 91.9% |
| Chelmsford 022B | 1,590 | 162.7 per 1,000 | 6 | 99.7% |
| Chelmsford 023A | 1,269 | 312.2 per 1,000 | 5 | 88.2% |
| Chelmsford 023B | 1,243 | 768.2 per 1,000 | 2 | 82.3% |
MPs for CM1
- Marie GoldmanLiberal DemocratMP for Chelmsford69% of CM1’s postcodes
- Mrs Kemi BadenochConservativeMP for North West Essex31% of CM1’s postcodes
- Sir John WhittingdaleConservativeMP for Maldon0.1% of CM1’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 CM19
Postcode sectors in CM17
Council1
Towns in CM11
Postcode districts next to CM17
Nearest rail stations1
More in the CM postcode area2
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.