| Chelmsford | |
|---|---|
| Coordinates: 51°45′14″N0°23′56″E / 51.754°N 0.399°E | |
| Country | United Kingdom | 
| Postcode area | CM | 
| Postcode area name | Chelmsford | 
| Post towns | 16 | 
| Postcode districts | 28 | 
| Postcode sectors | 103 | 
| Postcodes (live) | 17,864 | 
| Postcodes (total) | 27,233 | 
| Statistics as at May 2020 [1] | |
The CM postcode area, also known as the Chelmsford postcode area, [2] 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. [3]
The Stansted post town (CM24) is entirely surrounded by the Bishop's Stortford post town (CM22 and CM23). [2] The approximate coverage of the postcode districts:
| Postcode district | Post town | Coverage | Local authority area(s) | 
|---|---|---|---|
| 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, Thaxted | 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 | 
