CM9 postcode district

Postcodes and sectors

1,072 of the district's 1,727 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 51.74044, 0.69870, which locates the district, not a building.

Companies registered in CM9

Companies House lists 3,617 companies with a registered office in CM9; 261 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 CM9

• Essex
• Eastern
• Maldon
• Tollesbury
• Great Totham
• Tolleshunt D'Arcy
• Heybridge Basin
• Woodham Mortimer
• Goldhanger
• Little Totham
• Woodham Walter
• Tolleshunt Major
• Colchester
• Salcott-cum-Virley
• Tolleshunt Knights
• Langford
• Roundbush
• Mundon
• Curling Tye Green
• Braintree
• Ulting
• Totham Hill
• Broad Street Green
• Little Baddow

Roads filed under CM9

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 Turning
• Abbotsmead
• Acacia Drive
• Acorn Close
• Alder Mead
• America Street
• Anchorage Hill
• Anchor Lane
• Anson Close
• Ashfield Farm Road
• Ash Grove
• Atkins Crescent
• Aveley Way
• Avocet Way
• Avro Lane
• Back Road
• Bakers Lane
• Barber Close
• Barbrook Avenue
• Barnhall Road
• Baron's Lane
• Barrell Close
• Basin Road
• Bates Road
• Battle Rise
• Beacon Hill
• Beadle Place
• Beaumont Way
• Beckingham Road
• Beckingham Street
• Beeches Road
• Beeleigh Chase
• Beeleigh Road
• Belvedere Place
• Benbridge Close
• Ben Cobey Avenue
• Benham Close
• Blackthorn Drive
• Blackthorn Way
• Blackwater Close
• Blind Lane
• Blossom Row
• Bluebell Avenue
• Blue Mill Lane
• Blythe Way
• Boulton Road
• Bower Gardens
• Braeburn Drive
• Braxted Lane
• Brick House Road
• Brickspring Lane
• Brights Path
• Broad Street Green Road
• Brompton Gardens
• Brook Close
• Brooke Square
• Browning Road
• Bryant's Lane
• Bull Lane
• Burnham Road

Check an address in CM9

Check an address in CM9

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM9" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM9

What does a CM9 postcode tell you?

That the address lies in the CM9 district of the CM (Chelmsford) postcode area, and the place OS Open Names most often lists first for its postcodes is Maldon. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,072 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 CM9

• CM38.1 km
• CM88.5 km
• CO511.7 km
• CM9812.5 km
• CM012.7 km
• CM214.8 km
• SS515.1 km
• SS416.4 km
• CM116.6 km
• CM7717.2 km
• SS1117.6 km
• SS618.0 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids