CM17 postcode district

Postcodes and sectors

529 of the district's 658 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 51.77350, 0.14618, which locates the district, not a building.

Companies registered in CM17

Companies House lists 2,129 companies with a registered office in CM17; 550 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 CM17

• Essex
• Eastern
• Harlow
• Epping Forest
• Matching Green
• Hastingwood
• Foster Street
• Matching Tye
• Housham Tye
• Matching
• Threshers Bush
• Hobbs Cross
• Loyter's Green
• Newman's End
• Little Laver
• Manwood Green
• Uttlesford

Roads filed under CM17

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 Dale Close
• Alba Road
• Albert Gardens
• Albertine Street
• Alexander Mews
• Alexandra Road
• Allis Mews
• Amble Lane
• Apple Tree Walk
• Ashworth Place
• Aspen Way
• Aynsley Gardens
• Bale Crescent
• Barnfield Way
• Barnsley Wood Rise
• Basil Mews
• Beaker Mews
• Belfield Gardens
• Bentley Drive
• Birch Walk
• Bird Cherry Lane
• Bittern Lane
• Blackcap Drive
• Black Lion Court
• Blackthorn Drive
• Braggowens Ley
• Brambling Crescent
• Brickcroft Hoppit
• Broadway Avenue
• Bullfinch Road
• Bunting Street
• Burley Hill
• Bury Road
• Cambridge Road
• Campbell Close
• Canes Lane
• Canopy Lane
• Carters Mead
• Chalk Lane
• Challinor
• Chamberlain Close
• Chantry Gardens
• Chapel Fields
• Chapel Lane
• Chelsea Gardens
• Cherry Blossom Close
• Chippingfield
• Churchgate Street
• Church Langley Way
• Church Road
• Clay Lane
• Clifford Close
• Coalport Close
• Cobbins Way
• Colvers
• Coot Lane
• Cowlins
• Crossbill Way
• Crossway
• Currant Road

Check an address in CM17

Check an address in CM17

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

curl "https://spaw.co/api/v1/address/streets?country=GB&postal_code=CM17" \
  -H "Authorization: Bearer $SPAW_KEY"

Common questions about CM17

What does a CM17 postcode tell you?

That the address lies in the CM17 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 529 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 CM17

• CM203.0 km
• CM183.4 km
• CM214.3 km
• CM195.4 km
• CM925.9 km
• CM168.3 km
• CM59.1 km
• SG109.5 km
• EN1110.7 km
• CM2311.1 km
• CM2211.9 km
• SG1212.1 km
• Every district
• How a British address is written
• Check any address

distance between the districts' centroids