CM13 postcode district

Postcodes and sectors

702 of the district's 971 postcodes are live in the ONS Postcode Directory of August 2026. A postcode directory says whether a code is in use, never who is there. The live postcodes centre on 51.61496, 0.33829, which locates the district, not a building.

Companies registered in CM13

Companies House lists 3,829 companies with a registered office in CM13; 591 of them at addresses shared by 25 or more companies (1 October 2026 snapshot). 25 is the count at which the address lookup reports a company cluster.

Places OS Open Names lists for CM13

• Eastern
• Essex
• Brentwood
• West Horndon
• Ingrave
• Herongate
• Basildon
• Great Warley
• Havering's Grove
• Thurrock
• East Horndon
• Little Warley
• Padham's Green
• Childerditch
• Havering
• Greater London
• London

Roads filed under CM13

Named roads first, then numbered ones. A road is filed under one district even where it runs through several, so a street missing here may be listed under a neighbouring district — which is why the address lookup never calls a British street absent. Great Britain has no open register of buildings, so a listed road never means a building on it exists.

• Abenberg Way
• Alpha Road
• Ardleigh Gardens
• Arnolds Avenue
• Arnolds Close
• Arnolds Farm Lane
• Ashbeam Close
• Ashdon Close
• Aspen Court
• Bannister Drive
• Barington Court
• Barnston Way
• Bayleys Mead
• Beaumont Gardens
• Becket Close
• Beech Avenue
• Beredens Lane
• Billericay Road
• Birchwood Close
• Birdbrook Close
• Bird Lane
• Birkbeck Road
• Boleyn Gardens
• Bonningtons
• Boundary Drive
• Bournebridge Close
• Bowhay
• Bowmont Close
• Bradwell Green
• Brentwood Road
• Bridge Close
• Brindles Close
• Brockley Grove
• Brocksparkwood
• Brookfield Close
• Broxted Mews
• Bulphan View
• Burnell Walk
• Burns Way
• Burntwood Close
• Burses Way
• Byron Road
• Cadogan Avenue
• Camellia Close
• Canterbury Way
• Carpenter Path
• Carswell Close
• Cedar Close
• Cedar Road
• Chafford Gardens
• Challacombe Close
• Chancery Gate
• Chantreywood
• Chelmer Drive
• Cherry Avenue
• Chestnuts
• Childerditch Hall Drive
• Childerditch Lane
• Childerditch Street
• Church Lane

Check an address in CM13

Check an address in CM13

The same road list through the API, from the outward code alone:

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM13" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM13

What does a CM13 postcode tell you?

That the address lies in the CM13 district of the CM (Chelmsford) postcode area, and the place OS Open Names most often lists first for its postcodes is Brentwood. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 702 live postcodes.

Where the counts come from

• ons-postcode-directory · version 2026-08 · Contains ONS, OS and Royal Mail data © Crown copyright and database right 2026, Open Government Licence v3.0. Northern Ireland postcodes are excluded: their reuse needs a Land & Property Services licence.
• os-open-names · version 2026-11-01 · Contains OS data © Crown copyright and database right 2026, Open Government Licence v3.0.
• uk-companies-house · version 2026-10-01 · Companies House free company data product, Open Government Licence v3.0

What each figure means, and what a district page never says, is set out in Reading a British postcode district page; the glossary defines a postcode district, a postcode area, a postcode directory and a street register.

Data synced on 2026-11-01: the newest version among the datasets listed above.

Districts nearest CM13

• CM143.3 km
• CM154.1 km
• CM125.5 km
• SS157.5 km
• CM117.5 km
• CM47.6 km
• RM38.0 km
• RM148.2 km
• RM119.6 km
• SS169.8 km
• RM29.9 km
• SS1410.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids