What area is the CM postcode in?

CM is a postcode district in Chelmsford, Chelmsford, East of England, England. It is part of the CM postcode area.

How many addresses are in the CM postcode?

The CM postcode district covers Chelmsford in Chelmsford. The exact address count can be retrieved via the APITier Postcode Lookup API.

How do I look up addresses in CM programmatically?

Use the APITier Postcode Lookup API: GET https://postcode.apitier.com/v1/postcodes/{postcode}?x-api-key=YOUR_KEY — where the postcode begins with CM. The response returns all PAF addresses as structured JSON including building name, number, street, town, county, and geocoordinates.

Royal Mail PAF · East of England

CM Postcode — Chelmsford

CM is a postcode district in Chelmsford, Chelmsford, East of England, England. Use the lookup below to explore addresses within this postcode district.

Postcode District

CM — Chelmsford

Area

East of England

Region

Royal Mail PAF

Data Source

Postcode Lookup — CM DistrictSample

{
  "_note": "Sample response — enter any postcode above and click Lookup for live data",
  "status": 200,
  "result": {
    "postcode": "CM 1AA",
    "quality": 1,
    "eastings": 573012,
    "northings": 258891,
    "country": "England",
    "nhs_ha": "East of England",
    "longitude": 0.4716,
    "latitude": 51.7828,
    "european_electoral_region": "East of England",
    "primary_care_trust": "Chelmsford",
    "region": "East of England",
    "lsoa": "Chelmsford 001A",
    "msoa": "Chelmsford 001",
    "incode": "1AA",
    "outcode": "CM",
    "parliamentary_constituency": "Chelmsford",
    "admin_district": "Chelmsford",
    "parish": "Chelmsford, unparished area",
    "admin_county": "East of England",
    "admin_ward": "Chelmsford Central",
    "ced": null,
    "ccg": "NHS East of England",
    "nuts": "Chelmsford",
    "codes": {
      "admin_district": "E07000000",
      "admin_county": "E10000000",
      "admin_ward": "E05000000",
      "parish": "E43000000",
      "parliamentary_constituency": "E14000000",
      "ccg": "E38000000",
      "lsoa": "E01000000",
      "msoa": "E02000000"
    }
  }
}

About the CM Postcode District

The CM postcode district is part of the Chelmsford (CM) postcode area, covering Chelmsford and surrounding areas in East of England, England.

Postcodes in the CM district follow the format CM nXX where n is a digit and XX are letters. Each inward code identifies a specific delivery walk within the district.

The wider Chelmsford postcode area (CM) also covers: Harlow, Braintree, Witham, Brentwood, Epping.

Frequently Asked Questions

What area does the CM postcode cover?

The CM postcode district covers Chelmsford in Chelmsford, East of England, England. It is one of 23 districts in the CM postcode area.

How do I look up all addresses in the CM postcode?

Use the live lookup widget above or call the APITier Postcode Lookup API: GET https://postcode.apitier.com/v1/postcodes/{full postcode}?x-api-key=YOUR_KEY. Replace {full postcode} with any complete postcode beginning CM. The API returns all Royal Mail PAF addresses as structured JSON.

Is CM a valid UK postcode district?

Yes. CM is a Royal Mail postcode district in Chelmsford, England. Full UK postcodes in this district follow the format CM followed by a digit and two letters (e.g. CM 1AA).

CM Postcode — Chelmsford

About the CM Postcode District

Frequently Asked Questions

Other Chelmsford Postcode Districts