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CM1

UK postcode district

Updated September 2026

District overview

Postcode units
2,801
Current units
1,561
Coordinate coverage
100%
Electoral wards
16

Coverage context

Countries represented
England
English regions represented
East of England
Local authority codes
3
Terminated postcode units
1,240

Postcode sectors in CM1

Choose a sector to browse its complete postcode-unit directory.

8 sectors

Property

Across this district

View property report
37,025 recorded sales at this postcode
Address Date Price
248, Ongar Road, Writtle, Chelmsford, CM1 3NZ 24 July 2026 £590,000
46, Mayne Crest, Chelmsford, CM1 6UB 23 July 2026 £430,000
103, Bodmin Road, Chelmsford, CM1 6LN 20 July 2026 £468,000

Schools

Across this district

View schools report
Open schools
33
Primary
18
Secondary
6

Recorded crime

Across this district

View crime report
Published events
8,073
Months covered
12
Latest month
June 2026

Most recorded categories in this period

  • Violence and sexual offences 3,563
  • Shoplifting 979
  • Public order 582
  • Anti social behaviour 533
  • Other theft 507

Census 2021

Population and age profile

CM1 usual residents
69,427
Age-profile population
69,460

Age bands in CM1

Postcode district
Age 0 to 14
18%

12,529 residents

Age 15 to 24
11.1%

7,731 residents

Age 25 to 44
28.6%

19,867 residents

Age 45 to 64
24.9%

17,263 residents

Age 65 and over
17.4%

12,070 residents

How to read these estimates
The standard postcode headcounts and the commissioned age table are separate ONS outputs. Small counts are disclosure-controlled, and totals can differ slightly between tables. Coverage is England and Wales only.

Census Day: 21 March 2021. Sources: ONS/Nomis P001-P004 and ONS CT21_0228. Age table version 2024-04-08.

Fixed broadband coverage

The median Ofcom availability percentage across 1,449 current postcode units in this district. Each postcode is weighted equally, not by premises.

Superfast, 30 Mbit/s+
100%
Ultrafast, 100 Mbit/s+
100%
Ultrafast, 300 Mbit/s+
100%
Gigabit-capable
100%
Unable to receive decent fixed or FWA broadband
0%
Next Generation Access
100%
Decent broadband available from fixed wireless
0%

1,373 postcode units had 100% superfast coverage, 1,195 had 100% gigabit-capable coverage, and 4 had at least some premises without decent fixed or fixed-wireless access.

Coverage is a modelled postcode-level snapshot, not a speed test or a guarantee for a named property. Check availability with providers before making a decision. Ofcom does not publish postcode-level full-fibre coverage in this release for commercial-confidentiality reasons.

Source: Ofcom Connected Nations Spring 2026, version 2026-01-v2. Contains Ofcom data licensed under the Open Government Licence v3.0.

NHS ODS

GP practices

4

in this district

  • CHELMER MEDICAL PARTNERSHIP

    20 MERLIN PLACE, CHELMSFORD, CM1 4HW

    ODS code F81122

  • RIVERMEAD GATE MED.CTR.

    123 RECTORY LANE, CHELMSFORD, CM1 1TR

    ODS code F81071

  • THE WRITTLE SURGERY

    16A LORDSHIP ROAD, WRITTLE, CHELMSFORD, CM1 3EH

    ODS code F81098

  • WHITLEY HOUSE SURGERY

    CROMPTON BLD, WRITTLE ROAD, CHELMSFORD, CM1 3RW

    ODS code F81057

Organisation records, not service availability
These are records marked active in NHS England's Organisation Data Service for England and Wales. Branch surgeries, pharmacies, dentists and hospitals are not included. They do not confirm patient registration, services, opening hours, appointments or care quality. Distances are straight-line from the postcode point.

Source acquired on 2026-09-03. Contains information from NHS England, licenced under the current version of the Open Government Licence.

Evidence in context

A factual reading of the data in this report's scope. It is not a location score or a recommendation.

Property market

Recorded sales

The five-year median is £376,500 from 5,834 recorded sales in CM1. This is a recorded-sale statistic, not a current valuation.

The latest UK House Price Index average for Chelmsford is £383,103 in June 2026, down 1.2% year on year.

Schools

Published establishments

33 open schools are in scope, including 18 primary and 6 secondary schools.

Counts describe active establishment records. They do not assess admissions, catchments or quality.

Recorded crime

Published police records

8,073 published events cover 12 months, averaging 672.75 events per published month. The largest recorded category is Violence and sexual offences with 3,563 events.

The source publishes anonymised street-level events. These figures are not a measure of safety for an individual address.