CM11 postcode district

Postcodes and sectors

453 of the district's 604 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 51.62332, 0.44625, which locates the district, not a building.

Companies registered in CM11

Companies House lists 887 companies with a registered office in CM11; none of them at an address 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 CM11

• Essex
• Eastern
• Basildon
• Billericay
• Chelmsford
• Crays Hill
• Ramsden Heath
• Ramsden Bellhouse
• Downham
• Wickford
• Brock Hill
• Noak Hill

Roads filed under CM11

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.

• Abbots Ride
• Allens Road
• Anthony Close
• Approach Road
• Archer Close
• Ash Green
• Balmoral Close
• Barleylands Road
• Barns Road
• Beams Close
• Beams Way
• Belvedere Close
• Belvedere Lane
• Betoyne Close
• Beverley Rise
• Birds Close
• Borwick Lane
• Brabner Gardens
• Brackendale
• Break Egg Hill
• Briar Close
• Briar View
• Bridleway
• Britannia Close
• Bromfelde Road
• Brookside
• Brookside Close
• Broome Close
• Broome Road
• Bunting Lane
• Burns Close
• Burstead Drive
• Burstead Grange
• Bury Farm Lane
• Carsey Close
• Carson Road
• Carvers Wood
• Castledon Road
• Cavell Road
• Chantry Way
• Charfinch Crescent
• Chepstow Close
• Church Lane
• Church Road
• Church Street
• Coach Mews
• Coopers Drive
• Copford Close
• Copford Road
• Copperfield
• Corner Road
• Coulter Mews
• Coxes Farm Road
• Crays Hill
• Crays Hill Road
• Crown Road
• Crowsheath Lane
• Cumming Road
• Daines Road
• Darell Way

Check an address in CM11

Check an address in CM11

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM11" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM11

What does a CM11 postcode tell you?

That the address lies in the CM11 district of the CM (Chelmsford) postcode area, and the place OS Open Names most often lists first for its postcodes is Billericay. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 453 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 CM11

• CM122.3 km
• SS155.2 km
• SS125.5 km
• SS145.6 km
• SS116.4 km
• SS166.8 km
• CM47.0 km
• SS137.0 km
• CM137.5 km
• CM1510.2 km
• CM1410.7 km
• CM211.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids