The CM postcode area, also known as the Chelmsford postcode area, 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.

Coverage

The Stansted post town (CM24) is entirely surrounded by the Bishop's Stortford post town (CM22 and CM23). The approximate coverage of the postcode districts: ! rowspan="2"| CM0 ! CM1 ! CM2 ! CM3 ! CM4 ! CM5 ! CM6 ! CM7 ! CM8 ! CM9 ! CM11 ! CM12 ! CM13 ! CM14 ! CM15 ! CM16 ! CM17 ! CM18 ! CM19 ! CM20 ! CM21 ! CM22 ! CM23 ! CM24 ! CM77 ! style="background:#FFFFFF;"| CM92 ! style="background:#FFFFFF;"| CM98 ! style="background:#FFFFFF;"| CM99

Map