CO9 postcode district

Postcodes and sectors

928 of the district's 1,201 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 51.96896, 0.60958, which locates the district, not a building.

Companies registered in CO9

Companies House lists 1,862 companies with a registered office in CO9; 187 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 CO9

• Braintree
• Essex
• Eastern
• Halstead
• Sible Hedingham
• Great Yeldham
• Castle Hedingham
• Gosfield
• Ridgewell
• Great Maplestead
• Gestingthorpe
• Greenstead Green
• Wickham St Paul
• Birdbrook
• Little Maplestead
• Toppesfield
• Tilbury Juxta Clare
• Pebmarsh
• Little Yeldham
• Baythorne End
• Stambourne
• New England
• Cross End
• Whiteash Green

Roads filed under CO9

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 Meadow
• Abels Road
• Acorn Avenue
• Airfield Road
• Alderford Street
• Aletha Farm Place
• Alexandra Road
• Apple Tree Close
• Armstrong Way
• Ashen Road
• Ashley Street
• Ashlong Grove
• Ash Rise
• Ball's Chase
• Banbury Meadow
• Barkers Meadow
• Baron Way
• Bayley Street
• Beech Avenue
• Beech Grove
• Belchamp Road
• Bentall Close
• Beridge Road
• Bewick Court
• Birch Drive
• Birdbrook Road
• Bishop's Lane
• Blamsters Crescent
• Bois Hall Gardens
• Bourchier Way
• Bournebridge Hill
• Bourne Close
• Bowmans Park
• Box Mill Lane
• Braintree Road
• Brendon
• Brewry Drive
• Brewster Close
• Bridge Street
• Broad Road
• Brook Farm Close
• Brook Meadow
• Brook Street
• Brook Terrace
• Broom Hill
• Broton Drive
• Broyd Avenue
• Bullfinch Drive
• Burton's Green Road
• Butler Road
• Butlers Way
• Buttercup Way
• Cambridge Avenue
• Camoise Close
• Carleton Close
• Castle Close
• Castle Lane
• Castle Meadow
• Chaffinch Way
• Chapel End Way

Check an address in CO9

Check an address in CO9

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CO9" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CO9

What does a CO9 postcode tell you?

That the address lies in the CO9 district of the CO (Colchester) postcode area, and the place OS Open Names most often lists first for its postcodes is Halstead. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 928 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 CO9

• CM79.4 km
• CO810.8 km
• CM7712.1 km
• CO1012.6 km
• CO613.4 km
• CB917.3 km
• CM818.2 km
• CO319.3 km
• CM619.6 km
• CO121.9 km
• CO422.2 km
• CO522.3 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids