CM - Chelmsford
The postal area CM (Chelmsford) comprises of the following post towns; these towns should be written in capital letters when used in addresses.
Postal Districts within CM - Chelmsford
| Country | Post Town | Postal District |
| England | Southminster | CM0 7 |
| Burnham-on-Crouch | CM0 8 | |
| Chelmsford | CM1 CM2 CM3 |
|
| Ingatestone | CM4 | |
| Ongar | CM5 | |
| Dunmow | CM6 | |
| Braintree | CM7 | |
| Witham | CM8 | |
| Maldon | CM9 | |
| Billericay | CM11 CM12 |
|
| Brentwood | CM13 CM14 CM15 |
|
| Epping | CM16 | |
| Harlow | CM17 CM18 CM19 CM20 |
|
| Sawbridgeworth | CM21 | |
| Bishops Stortford | CM22 CM23 |
|
| Stansted | CM24 | |
| Braintree | CM77 |
