CM18 postcode district

Postcodes and sectors

430 of the district's 615 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 51.75524, 0.10611, which locates the district, not a building.

Companies registered in CM18

Companies House lists 1,233 companies with a registered office in CM18; 161 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 CM18

• Essex
• Eastern
• Harlow
• Epping Forest

Roads filed under CM18

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.

• Abbotsweld
• Aylets Field
• Barley Croft
• Barn Mead
• Berecroft
• Bishopsfield
• Brays Mead
• Brooklane Field
• Bushey Croft
• Cecil Court
• Charters Cross
• Chiron Square
• Chorus Close
• Church Leys
• Clifton Hatch
• Clover Field
• Commonside Road
• Copshall Close
• Corner Meadow
• Echo Lane
• Eve Drive
• Fern Hill Lane
• Finchmoor
• Five Acres
• Fountain Farm
• Gibb Croft
• Gladden Court
• Great Brays
• Great Leylands
• Hawthorns
• Highfield
• Hilly Field
• Hook Field
• Iceni Square
• John Dowdell Close
• Joyners Field
• Keaton Way
• Kingsland
• Latton Green
• Latton House
• Little Brays
• Little Pynchons
• Lodge Hall
• Long Banks
• Longfield
• Long Wood
• Lower Meadow
• Manor Hatch
• Manor Hatch Close
• Maunds Hatch
• Monksbury
• Moorfields
• Mosaic Lane
• Netteswellbury Farm
• Nicholls Field
• North Grove
• Oak End
• Oakview Drive
• Old Orchard
• Paddock Mead

Check an address in CM18

Check an address in CM18

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM18" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM18

What does a CM18 postcode tell you?

That the address lies in the CM18 district of the CM (Chelmsford) postcode area, and the place OS Open Names most often lists first for its postcodes is Harlow. The district alone does not place a street: the inward half of the full postcode narrows the address to one of the district's 430 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 CM18

• CM202.3 km
• CM192.5 km
• CM173.4 km
• CM923.5 km
• CM166.2 km
• CM216.9 km
• EN118.0 km
• EN99.1 km
• EN109.1 km
• SG1010.4 km
• CM510.5 km
• SG1210.7 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids