CM
Postcode areaPostcode area named after Chelmsford, with 28 districts.
Approximate outline worked out by Open Index from the ONS Postcode Directory: the outline joins its districts’ outlines, each made of the census output areas that hold most of the district’s postcodes.
Radon Affected Area by postcode area
Worked out by Open Index · 2022
About 6% of people in CM live in a 1 km square that the radon atlas marks as a radon Affected Area.
How CM compares
Each dot is a postcode area. The black line marks the middle one.
Every postcode area ranked: median sale price, population, people in radon affected area squares and gigabit broadband coverage.
Is CM safe? What police records show
In the 12 months to August 2026, police recorded crimes and anti-social behaviour in CM at a rate of 77.3 per 1,000 people.
In August 2026 alone, 5,498 cases of crime and anti-social behaviour were recorded in CM.
In the 12 months to August 2026, the most common types were violence and sexual offences (22,277), other crime (10,224) and anti-social behaviour (6,998).
A year earlier, the recorded crime rate in CM was 73.0 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.
Postcode districts in CM
| Name | People (census) | Median sale price | Recorded crime per 1,000 |
|---|---|---|---|
| CM0Burnham-on-Crouch, Southminster | 17,937 | £360,000 | 57.7 per 1,000 |
| CM1Chelmsford, Springfield | 69,073 | £400,000 | 104.2 per 1,000 |
| CM2Chelmsford, Moulsham | 60,932 | £380,000 | 79.2 per 1,000 |
| CM3South Woodham Ferrers | 56,315 | £465,000 | 52.3 per 1,000 |
| CM4Ingatestone, Stock | 10,828 | £690,000 | 50.3 per 1,000 |
| CM5Chipping Ongar, Shelley | 11,827 | £483,000 | 53.7 per 1,000 |
| CM6Great Dunmow | 29,394 | £465,000 | 50.1 per 1,000 |
| CM7Braintree, Bocking | 51,340 | £320,000 | 73.5 per 1,000 |
| CM8Witham, Chipping Hill | 35,455 | £340,000 | 71.6 per 1,000 |
| CM9Maldon, Heybridge | 35,767 | £382,000 | 53.1 per 1,000 |
| CM11Billericay, Sunnymede | 19,148 | £490,000 | 37.7 per 1,000 |
| CM12Billericay, Queen's Park | 20,043 | £500,000 | 55.0 per 1,000 |
| CM13Brentwood, Hutton | 25,211 | £490,000 | 58.1 per 1,000 |
| CM14Brentwood, Warley | 21,581 | £433,750 | 106.4 per 1,000 |
| CM15Brentwood, Pilgrims' Hatch | 23,555 | £530,000 | 66.1 per 1,000 |
| CM16Epping, Theydon Bois | 23,837 | £573,913 | 72.1 per 1,000 |
| CM17Harlow, Church Langley | 25,930 | £406,000 | 67.4 per 1,000 |
| CM18Harlow, Stewards | 25,945 | £325,000 | 117.5 per 1,000 |
| CM19Harlow, Great Parndon | 20,801 | £350,000 | 84.2 per 1,000 |
| CM20Harlow, Little Parndon | 25,834 | £315,000 | 170.8 per 1,000 |
| CM21Sawbridgeworth, High Wych | 11,371 | £450,000 | 54.1 per 1,000 |
| CM22Elsenham, Takeley | 16,111 | £515,000 | 82.1 per 1,000 |
| CM23Bishop's Stortford, New Town | 44,136 | £437,500 | 79.4 per 1,000 |
| CM24Stansted Mountfitchet | 8,977 | £450,000 | 157.3 per 1,000 |
| CM77Great Notley, Rayne | 15,434 | £382,598 | 50.2 per 1,000 |
| CM92Harlow, Eastend | No figure | No figure | No figure |
| CM98Chelmsford, Springfield | 318 | No figure | 197.5 per 1,000 |
| CM99Chelmer Village | 335 | No figure | 800.0 per 1,000 |
CM in brief
The CM postcode area, named after Chelmsford, has 28 postcode districts.
The median price paid for a home in CM was £415,000 in 2025.
CM had 707,435 usual residents at the census.
About 6% of people in CM live in a 1 km square that the radon atlas marks as a radon Affected Area.
In CM, 87.8% of homes and businesses could get gigabit-capable broadband in January 2026.