CM23 postcode district

Postcodes and sectors

1,200 of the district's 1,813 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 51.87276, 0.15803, which locates the district, not a building.

Companies registered in CM23

Companies House lists 4,181 companies with a registered office in CM23; 987 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 CM23

• Eastern
• East Hertfordshire
• Hertfordshire
• Bishop's Stortford
• Uttlesford
• Essex
• Manuden
• Birchanger
• Berden
• Thorley Street
• Spellbrook
• Farnham
• Hazel End
• Little London
• Thorley
• Farnham Green
• Level's Green
• Brick House End
• Maggots End
• Mount Pleasant
• Mallows Green
• Uppend
• Chatter End
• Stansted Mountfitchet

Roads filed under CM23

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.

• Abbotts Way
• Adams Close
• Adderley Road
• Albury Place
• Alconbury
• Alder Close
• Allerthorp Road
• All Saints Close
• Almond Close
• Alpha Place
• Ambrose Close
• Anchor Street
• Anderson Close
• Anglesey Close
• Apple Rise
• Appleton Fields
• Apsley Close
• Apton Court
• Apton Fields
• Apton Road
• Archer Place
• Armourers Close
• Ascot Close
• Ashby Rise
• Ashdale
• Ashwell Drive
• Aster Close
• Athenian Drive
• Atherton Close
• Audrey Gardens
• Avenue Road
• Aynsworth Avenue
• Badgers
• Baker Drive
• Bakers Court
• Barbon Close
• Barker Close
• Barley Hills
• Barn Field
• Barrells Down Road
• Barrett Lane
• Bartholomew Road
• Basbow Lane
• Bass Close
• Beaumont Avenue
• Beechlands
• Beeston Crescent
• Beldams Gate
• Beldams Lane
• Bells Hill
• Benhooks Avenue
• Benskins Close
• Bentley Close
• Bergham Close
• Berlyn Close
• Bingley Close
• Birchanger Lane
• Birchwood
• Birchwood Mews
• Bishop's Avenue

Check an address in CM23

Check an address in CM23

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM23" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM23

What does a CM23 postcode tell you?

That the address lies in the CM23 district of the CM (Chelmsford) postcode area, and the place OS Open Names most often lists first for its postcodes is Bishop's Stortford. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 1,200 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 CM23

• CM244.3 km
• CM224.9 km
• SG106.3 km
• CM216.8 km
• SG118.7 km
• CM1711.1 km
• CM2011.4 km
• CM9213.3 km
• CM1813.5 km
• SG1213.7 km
• CM1913.9 km
• CM614.2 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids