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CO1 1AH

Castle · Colchester · England

Updated September 2026

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Location overview

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Ward
Castle
Local authority
Colchester
Constituency
Colchester
Postcode district
CO1
Postcode sector
CO1 1

Nearby postcodes

Nearby postcode distances
Postcode Distance
CO1 1AN 33 m
CO1 1AU 55 m
CO1 1AJ 62 m
CO1 1AG 79 m
CO1 1DL 79 m
Complete postcode fields and official codes
Postcode
CO1 1AH
Status
Current
Introduced
1 June 2002
Terminated
Not published
Postcode area
CO
Postcode district
CO1
Postcode sector
CO1 1
Latitude
51.898204
Longitude
0.897031
British National Grid easting
599,414
British National Grid northing
226,149

Statistical and administrative geographies

Country
England · E92000001
Region
East of England · E12000006
Local authority district
Colchester · E07000071
Electoral ward
Castle · E05010828
Parish or community
E43000228
Westminster constituency
Colchester · E14001176
Output area
E00176426
Lower layer super output area
Colchester 007E · E01021650
Middle layer super output area
Colchester 007 · E02004512

Postcode source versions

Explore CO1

Use the wider postcode district to compare the same evidence across more locations.

Schools

Within 3.1 miles of this postcode

View all nearby schools
Open schools
61
Primary
40
Secondary
11

  1. North Primary School and Nursery

    Community school

    318 m

  2. St Helena School

    Academy converter

    675 m

  3. Colchester Institute

    Further education

    779 m

Recorded crime

Within 1 mile of this postcode

View all nearby crime records
Published events
4,972
Months covered
12
Latest month
June 2026

Most recorded categories in this period

  • Violence and sexual offences 2,228
  • Shoplifting 562
  • Anti social behaviour 388
  • Public order 376
  • Other theft 319

Census 2021

Population and age profile

Postcode residents
37

23 female, 14 male

Postcode households
12
Residents per household
3.1
CO1 1 residents
5,694

Age bands in CO1 1

Wider postcode sector
Age 0 to 14
17%

923 residents

Age 15 to 24
9.8%

533 residents

Age 25 to 44
38.8%

2,110 residents

Age 45 to 64
21.2%

1,150 residents

Age 65 and over
13.2%

717 residents

This postcode contained 0.6% of the sector's usual residents on Census Day. The age profile describes the wider CO1 1 sector, not people in this individual postcode.

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

Ofcom's predicted availability across all residential and commercial premises in this postcode in January 2026.

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%
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

12

within 5 km

  • TURNER ROAD SURGERY

    THE PRIMARY CARE CENTRE, TURNER ROAD, COLCHESTER, CO4 5JR

    ODS code Y02646

    1.0 km

  • BEACON HOUSE MINISTRIES

    24 CROUCH STREET, COLCHESTER, CO3 3ES

    ODS code Y01297

    1.2 km

  • COLCHESTER MEDICAL PRACTICE

    78 EAST HILL, COLCHESTER, CO1 2QS

    ODS code F81042

    1.2 km

  • EAST HILL SURGERY

    78 EAST HILL, COLCHESTER, CO1 2RW

    ODS code F81091

    1.2 km

  • MILL ROAD SURGERY

    47 MILL ROAD, MILE END, COLCHESTER, CO4 5LE

    ODS code F81636

    1.6 km

  • CREFFIELD MEDICAL GROUP

    CREFFIELD MEDICAL CENTRE, 15 CAVALRY ROAD, COLCHESTER, CO2 7GH

    ODS code F81115

    1.8 km

  • HIGHWOODS SURGERY

    HIGHWOODS SQUARE, HIGHWOODS, COLCHESTER, CO4 9SR

    ODS code F81679

    2.0 km

  • ABBEY FIELD MEDICAL CENTRE

    YPRES ROAD, COLCHESTER, CO2 7UW

    ODS code F81095

    2.3 km

  • BLUEBELL SURGERY

    BLUEBELL RESOURCE CENTRE, JACK ANDREWS DRIVE, HIGHWOODS, COLCHESTER, CO4 9YN

    ODS code F81746

    2.7 km

  • AMBROSE AVENUE GROUP PRACTICE

    76 AMBROSE AVENUE, COLCHESTER, CO3 4LN

    ODS code F81067

    3.1 km

  • WINSTREE MEDICAL PRACTICE

    84 WINSTREE ROAD, STANWAY, COLCHESTER, CO3 0PZ

    ODS code F81069

    4.1 km

  • TOLLGATE HEALTH CENTRE

    145 LONDON ROAD, STANWAY, COLCHESTER, CO3 8NZ

    ODS code F81716

    4.8 km

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.

Nearby transport

  • Catchpool Road

    BCT · Colchester

    0.1 miles

  • Railway Station Layby

    BCT · Colchester

    0.1 miles

  • The Albert

    BCT · Colchester

    0.1 miles

  • Catchpool Road

    BCT · Colchester

    0.1 miles

  • Railway Station Layby

    BCT · Colchester

    0.1 miles

Relative deprivation

English Indices of Deprivation 2025 for Colchester 007E, the published LSOA linked to this postcode. Decile 1 contains the most deprived 10% of English LSOAs and decile 10 the least deprived 10%.

Overall IMD decile

5 of 10

Overall England rank

15,810 of 33,755

Income
5 of 10
Employment
5 of 10
Education and skills
6 of 10
Health and disability
5 of 10
Crime
2 of 10
Housing and services
8 of 10
Living environment
4 of 10

These are relative area statistics, not measures of an individual household, affluence or absolute change. They cannot be compared with indices for other UK nations. Source: English Indices of Deprivation 2025, version 2025-v2.

Flood risk

Environment Agency long-term indicators for the area around addresses in this postcode. They are not an assessment of any individual property and do not show current or forecast flooding.

High risk addresses
0
Medium risk addresses
0
Low risk addresses
1
Groundwater flood alert area
Unlikely

Source: Environment Agency flood-risk postcode search tool data, version 2026-06-18. Check the long-term risk for an individual area. © Environment Agency copyright and/or database right 2025. All rights reserved.

Evidence in context

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

Schools

Published establishments

61 open schools are in scope, including 40 primary and 11 secondary schools. North Primary School and Nursery is the nearest published school at 318 m.

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

Recorded crime

Published police records

4,972 published events cover 12 months, averaging 414.333 events per published month. The largest recorded category is Violence and sexual offences with 2,228 events.

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