What area is the CM4 postcode in?

CM4 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 CM4 postcode?

The CM4 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 CM4 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 CM4. The response returns all PAF addresses as structured JSON including building name, number, street, town, county, and geocoordinates.

Royal Mail PAF · East of England

CM4 Postcode — Chelmsford

CM4 is a postcode district in Chelmsford, Chelmsford, East of England, England. Use the lookup below to explore addresses within this postcode district.

CM4

Postcode District

CM — Chelmsford

Area

East of England

Region

Royal Mail PAF

Data Source

Postcode Lookup — CM4 DistrictSample

{
  "_note": "Sample response — enter any postcode above and click Lookup for live data",
  "status": 200,
  "result": {
    "postcode": "CM4 1AA",
    "quality": 1,
    "eastings": 576960,
    "northings": 254096,
    "country": "England",
    "nhs_ha": "East of England",
    "longitude": 0.528,
    "latitude": 51.7396,
    "european_electoral_region": "East of England",
    "primary_care_trust": "Chelmsford",
    "region": "East of England",
    "lsoa": "Chelmsford 001A",
    "msoa": "Chelmsford 001",
    "incode": "1AA",
    "outcode": "CM4",
    "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 CM4 Postcode District

The CM4 postcode district is part of the Chelmsford (CM) postcode area, covering Chelmsford and surrounding areas in East of England, England.

Postcodes in the CM4 district follow the format CM4 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 CM4 postcode cover?

The CM4 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 CM4 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 CM4. The API returns all Royal Mail PAF addresses as structured JSON.

Is CM4 a valid UK postcode district?

Yes. CM4 is a Royal Mail postcode district in Chelmsford, England. Full UK postcodes in this district follow the format CM4 followed by a digit and two letters (e.g. CM4 1AA).

CM4 Postcode — Chelmsford

About the CM4 Postcode District

Frequently Asked Questions

Other Chelmsford Postcode Districts