| CM0 |
SOUTHMINSTER |
Southminster, Bradwell, Tillingham, Asheldham, Dengie |
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 |
| CM92 |
CHELMSFORD |
Sandringham House |
non-geographic |
| CM98 |
CHELMSFORD |
Jobcentre Plus |
non-geographic |
| CM99 |
CHELMSFORD |
PO Box Users |
non-geographic |