What area is the CM1 postcode in?

CM1 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 CM1 postcode?

The CM1 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 CM1 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 CM1. The response returns all PAF addresses as structured JSON including building name, number, street, town, county, and geocoordinates.

Royal Mail PAF · East of England

CM1 Postcode — Chelmsford

CM1 is a postcode district in Chelmsford, Chelmsford, East of England, England. Use the lookup below to explore addresses within this postcode district.

CM1

Postcode District

CM — Chelmsford

Area

East of England

Region

Royal Mail PAF

Data Source

Postcode Lookup — CM1 DistrictSample

{
  "_note": "Sample response — enter any postcode above and click Lookup for live data",
  "status": 200,
  "result": {
    "postcode": "CM1 1AA",
    "quality": 1,
    "eastings": 576960,
    "northings": 253874,
    "country": "England",
    "nhs_ha": "East of England",
    "longitude": 0.528,
    "latitude": 51.7376,
    "european_electoral_region": "East of England",
    "primary_care_trust": "Chelmsford",
    "region": "East of England",
    "lsoa": "Chelmsford 001A",
    "msoa": "Chelmsford 001",
    "incode": "1AA",
    "outcode": "CM1",
    "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 CM1 Postcode District

The CM1 postcode district is part of the Chelmsford (CM) postcode area, covering Chelmsford and surrounding areas in East of England, England.

Postcodes in the CM1 district follow the format CM1 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 CM1 postcode cover?

The CM1 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 CM1 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 CM1. The API returns all Royal Mail PAF addresses as structured JSON.

Is CM1 a valid UK postcode district?

Yes. CM1 is a Royal Mail postcode district in Chelmsford, England. Full UK postcodes in this district follow the format CM1 followed by a digit and two letters (e.g. CM1 1AA).

CM1 Postcode — Chelmsford

About the CM1 Postcode District

Frequently Asked Questions

Other Chelmsford Postcode Districts