CM11
Postcode districtPostcode district covering Billericay, Sunnymede and South Green, in Basildon and 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 CM11 postcode. How census figures are added up
Gigabit coverage by postcode district
Connected Nations (Ofcom) · January 2026
In CM11, 87.6% of homes and businesses could get gigabit-capable broadband in January 2026.
How CM11 compares
Each dot is a postcode district. The black line marks the middle one.
Is CM11 safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in CM11 at a rate of 37.7 per 1,000 people.
That compares with 77.3 per 1,000 people across CM.
In August 2026 alone, 43 cases of crime and anti-social behaviour were recorded in CM11.
In the 12 months to August 2026, the most common types were violence and sexual offences (328), other crime (140) and criminal damage and arson (65).
A year earlier, the recorded crime rate in CM11 was 36.6 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 CM11, neighbourhood by neighbourhood
- Deprivation is ranked by neighbourhood, so CM11 has no single figure. Of its 13 neighbourhoods with a rank:
- Decile 3: 1 neighbourhood
- Decile 5: 2 neighbourhoods
- Decile 7: 1 neighbourhood
- Decile 8: 3 neighbourhoods
- Decile 9: 2 neighbourhoods
- Decile 10 (England’s least deprived 10%): 4 neighbourhoods
English Indices of Deprivation 2025. Decile 1 is the most deprived tenth of neighbourhoods in England.
Neighbourhoods in CM11
| Name | People (census) | Recorded crime per 1,000 | Deprivation decile | Gigabit broadband |
|---|---|---|---|---|
| Basildon 001A | 1,367 | 22.0 per 1,000 | 10 | 55.7% |
| Basildon 001B | 1,367 | 16.8 per 1,000 | 10 | 97.7% |
| Basildon 001C | 1,252 | 30.6 per 1,000 | 9 | 91.0% |
| Basildon 003A | 1,450 | 15.4 per 1,000 | 10 | 99.1% |
| Basildon 003B | 1,769 | 62.2 per 1,000 | 8 | 68.7% |
| Basildon 003C | 1,714 | 50.3 per 1,000 | 5 | 98.7% |
| Basildon 003D | 1,669 | 26.3 per 1,000 | 10 | 98.8% |
| Basildon 004E | 1,712 | 66.4 per 1,000 | 5 | 92.7% |
| Basildon 006A | 1,467 | 36.9 per 1,000 | 7 | 78.9% |
| Basildon 009B | 1,571 | 40.7 per 1,000 | 9 | 91.4% |
| Basildon 009C | 1,550 | 38.6 per 1,000 | 8 | 99.1% |
| Basildon 009D | 1,821 | 78.7 per 1,000 | 3 | 64.0% |
| Chelmsford 018D | 2,332 | 34.5 per 1,000 | 8 | 90.1% |
MPs for CM11
- Mr Richard HoldenConservativeMP for Basildon and Billericay82% of CM11’s postcodes
- Sir John WhittingdaleConservativeMP for Maldon18% of CM11’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 CM113
Postcode sectors in CM112
Councils CM11 covers2
Towns in CM111
Postcode districts next to CM116
Nearest rail stations3
More in the CM postcode area2
CM11 in brief
CM11 is a postcode district covering Billericay, Sunnymede and South Green, in Basildon and Chelmsford.
About 19,276 people lived in CM11 in mid-2024 (worked out by Open Index from ONS small-area estimates); the median price paid for a home was £490,000 in 2025 across 298 sales (HM Land Registry) and police recorded crimes and anti-social behaviour at a rate of 37.7 per 1,000 people in the 12 months to August 2026 (police.uk).
The median price paid for a home in CM11 was £490,000 in 2025.
CM11 had 19,148 usual residents at the census.
In CM11, 87.6% of homes and businesses could get gigabit-capable broadband in January 2026.
In CM11, 1.8% of residents aged 16 to 64 were claiming out-of-work benefits in August 2026.