CM3 postcode district

Postcodes and sectors

1,588 of the district's 2,180 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 51.72189, 0.58440, which locates the district, not a building.

Companies registered in CM3

Companies House lists 4,016 companies with a registered office in CM3; 722 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 CM3

• Essex
• Eastern
• Chelmsford
• Maldon
• South Woodham Ferrers
• Braintree
• Hatfield Peverel
• Danbury
• Boreham
• Great Leighs
• Mayland
• Latchingdon
• Bicknacre
• Little Baddow
• East Hanningfield
• Great Waltham
• North Fambridge
• Uttlesford
• Althorne
• Cold Norton
• Little Waltham
• Purleigh
• Nounsley
• Maylandsea

Roads filed under CM3

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.

• Abbey Fields
• Abbotsleigh Road
• Agar Place
• Akenfield Close
• Albatross Way
• Albert Road
• Alderbury Lea
• Algars Way
• Allens Close
• Amber Close
• Amber Link
• Anchor Reach
• Anchor Way
• Anson Close
• Aragon Road
• Arla Mews
• Arlington Square
• Armonde Close
• Armstrong Close
• Armstrong Road
• Arthy Close
• Arwen Grove
• Ash Close
• Ashley Green
• Ashmans Row
• Audley Road
• Augustine Way
• Austral Way
• Back Lane
• Baker Avenue
• Bakers Close
• Bakers Lane
• Bakers Mead
• Balmoral Road
• Banbury Square
• Bancrofts Road
• Bandhills Close
• Bankside Close
• Banters Lane
• Barbrook Way
• Barley Mead
• Barnes Farm Drive
• Baron's Lane
• Baron Road
• Barrack Lane
• Bartholomew Avenue
• Bartlett Close
• Barton Close
• Bassetts Lane
• Baxters
• Beadle Way
• Bearmains
• Beatty Rise
• Beaulieu Park Station Approach
• Beaulieu Parkway
• Beaumont Park
• Becket Way
• Beech Drive
• Beech Rise
• Belfry Avenue

Check an address in CM3

Check an address in CM3

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM3" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM3

What does a CM3 postcode tell you?

That the address lies in the CM3 district of the CM (Chelmsford) postcode area, and the place OS Open Names most often lists first for its postcodes is South Woodham Ferrers. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,588 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 CM3

• CM985.6 km
• CM26.7 km
• CM98.1 km
• CM19.1 km
• CM810.1 km
• SS1112.0 km
• SS513.3 km
• SS1213.7 km
• CM414.4 km
• CM1114.5 km
• SS614.9 km
• CM1215.7 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids