| Area Code: | CM |
The CM postcode area, also known as the Chelmsford postcode area,[1] is a group of 25 postcode districts in England, within 16 post towns. These cover central Essex (including Chelmsford, Harlow, Brentwood, Billericay, Braintree, Burnham-on-Crouch, Dunmow, Epping, Ingatestone, Maldon, Ongar, Southminster, 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.[2]
__TOC__
The Stansted post town (CM24) is entirely surrounded by the Bishop's Stortford post town (CM22 and CM23).[1] The approximate coverage of the postcode districts:
|-! rowspan="2"| CM0| SOUTHMINSTER | Southminster, Bradwell, Tillingham, Asheldham, Dengie| rowspan="2"|Maldon|-| BURNHAM-ON-CROUCH | Burnham-on-Crouch, Tillingham|-! CM1| CHELMSFORD| Chelmsford, Writtle| Chelmsford, Uttlesford|-! CM2| CHELMSFORD| Chelmsford| Chelmsford|-! CM3| CHELMSFORD| Hatfield Peverel, South Woodham Ferrers, North Fambridge, Cold Norton, Boreham, Maylandsea| Chelmsford, Maldon, Braintree, Uttlesford|-! CM4| INGATESTONE| Blackmore, Fryerning, Ingatestone, Margaretting, Stock| Brentwood, Chelmsford, Epping Forest|-! CM5| ONGAR| Chipping Ongar, High Ongar, Bobbingworth, Moreton, The Lavers, The Rodings| Epping Forest, Chelmsford|-! CM6| DUNMOW| Great Dunmow, Felsted| Uttlesford, Chelmsford|-! CM7| BRAINTREE| Braintree, Finchingfield, Great Bardfield| Braintree, Uttlesford|-! CM8| WITHAM| Witham| Braintree, Maldon|-! CM9| MALDON| Maldon, Tollesbury, Tolleshunt D'Arcy, Tolleshunt Knights| Maldon, Colchester, Chelmsford|-! CM11| BILLERICAY| Billericay (East), Great Burstead| Basildon, Chelmsford|-! CM12| BILLERICAY| Billericay (West), Little Burstead| Basildon, Brentwood|-! CM13| BRENTWOOD| Brentwood, East Horndon, Great Warley, Herongate, Hutton, Ingrave, Little Warley, West Horndon| Brentwood, Basildon, Havering|-! CM14| BRENTWOOD| Brentwood, Warley| Brentwood, Havering|-! CM15| BRENTWOOD| Brentwood, Doddinghurst, Kelvedon Hatch, Mountnessing, Shenfield, Stondon Massey, Pilgrims Hatch| Brentwood|-! CM16| EPPING| Epping, Theydon Bois, North Weald| Epping Forest|-! CM17| HARLOW| Harlow, Old Harlow, Matching, Matching Tye, Matching Green, Church Langley| Harlow, Epping Forest, Uttlesford|-! CM18| HARLOW| Harlow| Harlow, Epping Forest|-! CM19| HARLOW| Harlow, 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, Manuden| East Hertfordshire, Uttlesford|-! CM24| STANSTED| Stansted Mountfitchet, Stansted Airport| Uttlesford|-! CM77| BRAINTREE| Braintree, Great Notley, 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|}