CO12 postcode district

Postcodes and sectors

644 of the district's 832 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 51.93105, 1.25216, which locates the district, not a building.

Companies registered in CO12

Companies House lists 684 companies with a registered office in CO12; 35 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 CO12

• Tendring
• Essex
• Eastern
• Harwich
• Great Oakley
• Parkeston
• Little Oakley
• Ramsey
• Stones Green

Roads filed under CO12

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.

• Abbott Road
• Abdy Avenue
• Acorn Close
• Adelaide Street
• Ainger Road
• Albemarle Street
• Albert Street
• Aldon Close
• Alexandra Road
• Alexandra Street
• Allfields
• All Saints Close
• Angelgate
• Anson Close
• Arderne Close
• Artillery Drive
• Ashley Road
• Aspen Way
• Back Lane
• Bagshaw Road
• Balton Way
• Barrack Lane
• Bay Road
• Bay View Crescent
• Beach Road
• Beacon Hill Avenue
• Beaumont Road
• Beech Grove
• Bernard Mews
• Beryl Road
• Bexley Avenue
• Birch Avenue
• Blacksmith's Lane
• Blackthorn Drive
• Blackthorn Road
• Bluebell Grove
• Bramble Tye
• Briardale Avenue
• Brooklyn Mews
• Brooklyn Road
• Bruges Close
• Brussels Close
• Buck's Lane
• Bullfinch Close
• Burr Close
• Canning Street
• Castlegate Street
• Celandine Way
• Chaffinch Drive
• Chamomile Way
• Chase Court
• Chase Lane
• Cherry Tree Close
• Chevy Court
• Church Hill
• Church Lane
• Church Street
• Clacton Road
• Clarke's Road
• Clayton Road

Check an address in CO12

Check an address in CO12

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CO12" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CO12

What does a CO12 postcode tell you?

That the address lies in the CO12 district of the CO (Colchester) postcode area, and the place OS Open Names most often lists first for its postcodes is Harwich. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 644 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 CO12

• IP117.3 km
• CO149.0 km
• IP99.6 km
• IP109.8 km
• CO1310.3 km
• CO1112.1 km
• IP313.0 km
• IP514.5 km
• CO1614.9 km
• IP215.1 km
• IP415.2 km
• CO1516.4 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids