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{{redirect|CM6|the chord|Sixth chord}}
{{short description|Postcode area within the United Kingdom}}
{{Use dmy dates|date=November 2019}}
{{Use British English|date=April 2025}}
{{Infobox UK postcode area|area_code=CM}}
The '''CM postcode area''', also known as the '''Chelmsford postcode area''',<ref name=guide>Royal Mail, ''Address Management Guide'', (2004)</ref> is a group of 25 postcode districts in [[England]], within 16 [[post town]]s. These cover central [[Essex]] (including [[Chelmsford]], [[Harlow]], [[Brentwood, Essex|Brentwood]], [[Billericay]], [[Braintree, Essex|Braintree]], [[Burnham-on-Crouch]], [[Great Dunmow|Dunmow]], [[Epping, Essex|Epping]], [[Ingatestone]], [[Maldon, Essex|Maldon]], [[Chipping Ongar|Ongar]], [[Southminster]], [[Stansted Mountfitchet|Stansted]] and [[Witham]]), plus a small part of east [[Hertfordshire]] (including [[Bishop's Stortford]] and [[Sawbridgeworth]]) and a very small part of the [[London Borough of Havering]].

The southern part of the CM7 district for Braintree was recoded to CM77 in 2002.<ref>{{cite web |title=Royal Mail Update 34 |url=http://www.beacon-dodsworth.co.uk/site/support/postcode_update_34/ |publisher=Beacon Dodsworth |access-date=23 August 2015}}</ref>

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==Coverage==
The Stansted [[post town]] (CM24) is entirely surrounded by the Bishop's Stortford post town (CM22 and CM23).<ref name=guide/> The approximate coverage of the postcode districts:

{{postcode area table start}}
|-
! rowspan="2"| CM0
| SOUTHMINSTER
| [[Southminster]], [[Bradwell-on-Sea|Bradwell]], [[Tillingham]], [[Asheldham]], [[Dengie]]
| rowspan="2"|[[Maldon District|Maldon]]
|-
| BURNHAM-ON-CROUCH
| [[Burnham-on-Crouch]], [[Tillingham]]
|-
! CM1
| CHELMSFORD
| [[Chelmsford]], [[Writtle]]
| [[City of Chelmsford|Chelmsford]], [[Uttlesford]]
|-
! CM2
| CHELMSFORD
| Chelmsford
| Chelmsford
|-
! CM3
| CHELMSFORD
| [[Hatfield Peverel]], [[South Woodham Ferrers]], [[North Fambridge]], [[Cold Norton]], [[Boreham]], [[Maylandsea]]
| Chelmsford, Maldon, [[Braintree District|Braintree]], Uttlesford
|-
! CM4
| INGATESTONE
| [[Blackmore]], [[Fryerning]], [[Ingatestone]], [[Margaretting]], [[Stock, Essex|Stock]]
| [[Borough of Brentwood|Brentwood]], Chelmsford, [[Epping Forest District|Epping Forest]]
|-
! CM5
| ONGAR
| [[Chipping Ongar]], [[High Ongar]], [[Bobbingworth]], [[Moreton, Essex|Moreton]], The Lavers, [[The Rodings]]
| Epping Forest, Chelmsford
|-
! CM6
| DUNMOW
| [[Great Dunmow]], [[Felsted]], [[Thaxted]]
| Uttlesford, Chelmsford
|-
! CM7
| BRAINTREE
| [[Braintree, Essex|Braintree]], [[Finchingfield]], [[Great Bardfield]]
| Braintree, Uttlesford
|-
! CM8
| WITHAM
| [[Witham]]
| Braintree, Maldon
|-
! CM9
| MALDON
| [[Maldon, Essex|Maldon]], [[Tollesbury]], [[Tolleshunt D'Arcy]], [[Tolleshunt Knights]]
| Maldon, [[Borough of Colchester|Colchester]], Chelmsford
|-
! CM11
| BILLERICAY
| [[Billericay|Billericay (East)]], [[Great Burstead]]
| [[Borough of Basildon|Basildon]], Chelmsford
|-
! CM12
| BILLERICAY
| Billericay (West), [[Little Burstead]]
| Basildon, Brentwood
|-
! CM13
| BRENTWOOD
| [[Brentwood, Essex|Brentwood]], [[East Horndon]], [[Great Warley]], [[Herongate]], [[Hutton, Essex|Hutton]], [[Ingrave]], [[Little Warley]], [[West Horndon]]
| Brentwood, Basildon, [[London Borough of Havering|Havering]]
|-
! CM14
| BRENTWOOD
| Brentwood, [[Warley, Essex|Warley]]
| Brentwood, Havering
|-
! CM15
| BRENTWOOD
| Brentwood, [[Doddinghurst]], [[Kelvedon Hatch]], [[Mountnessing]], [[Shenfield]], [[Stondon Massey]], [[Pilgrims Hatch]]
| Brentwood
|-
! CM16
| EPPING
| [[Epping, Essex|Epping]], [[Theydon Bois]], [[North Weald]]
| Epping Forest
|-
! CM17
| HARLOW
| [[Harlow]], [[Old Harlow]], [[Matching, Essex|Matching]], [[Matching Tye]], [[Matching Green]], [[Church Langley]]
| [[Harlow]], Epping Forest, Uttlesford
|-
! CM18
| HARLOW
| Harlow
| Harlow, Epping Forest
|-
! CM19
| HARLOW
| Harlow, [[Roydon, Essex|Roydon]]
| Harlow, Epping Forest
|-
! CM20
| HARLOW
| Harlow, [[Gilston]]
| Harlow, [[East Hertfordshire]]
|-
! CM21
| SAWBRIDGEWORTH
| [[Sawbridgeworth]]
| East Hertfordshire, Epping Forest
|-
! CM22
| BISHOP'S STORTFORD
| [[Bishop's Stortford]], [[Sheering]]
| Uttlesford, East Hertfordshire, Epping Forest
|-
! CM23
| BISHOP'S STORTFORD
| Bishop's Stortford, [[Thorley, Hertfordshire|Thorley]], [[Manuden]]
| East Hertfordshire, Uttlesford
|-
! CM24
| STANSTED
| [[Stansted Mountfitchet]], [[Stansted Airport]]
| Uttlesford
|-
! CM77
| BRAINTREE
| [[Braintree, Essex|Braintree]], [[Great Notley]], [[Rayne, Essex|Rayne]]
| Braintree, Uttlesford, Chelmsford
|-
! style="background:#FFFFFF;"| CM92
| style="background:#FFFFFF;"| CHELMSFORD
| style="background:#FFFFFF;"| Sandringham House
| style="background:#FFFFFF;"| ''non-geographic''
|-
! style="background:#FFFFFF;"| CM98
| style="background:#FFFFFF;"| CHELMSFORD
| style="background:#FFFFFF;"| Jobcentre Plus
| style="background:#FFFFFF;"| ''non-geographic''
|-
! style="background:#FFFFFF;"| CM99
| style="background:#FFFFFF;"| CHELMSFORD
| style="background:#FFFFFF;"| ''PO Box Users''
| style="background:#FFFFFF;"| ''non-geographic''
|}

==Map==
{{Attached KML|display=inline}}
{{Postcode area imagemap|map=CM postcode area|size=550x550px}}

==See also==
* [[List of postcode areas in the United Kingdom]]
*[[Postcode Address File]]

==References==
{{Reflist}}

==External links==
*[http://www.poweredbypaf.com/ Royal Mail's Postcode Address File]
*[https://web.archive.org/web/20180926234202/https://www.poweredbypaf.com/how-the-royal-mail-postcode-address-file-paf-helps-organisations-verify-their-customers-identities/ A quick introduction to Royal Mail's Postcode Address File (PAF)]

{{Postcode areas in the United Kingdom}}

[[Category:Postcode areas covering the East of England]]
[[Category:Borough of Basildon]]
[[Category:Borough of Brentwood]]
[[Category:Braintree District]]
[[Category:City of Chelmsford]]
[[Category:Epping Forest District]]
[[Category:Harlow]]
[[Category:Maldon District]]
[[Category:Uttlesford]]

CM postcode area - Revision history

imported>Keith D: Add BOT tag