What area is the CO postcode in?

CO is a postcode district in Colchester, Colchester, East of England, England. It is part of the CO postcode area.

How many addresses are in the CO postcode?

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

How do I look up addresses in CO 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 CO. The response returns all PAF addresses as structured JSON including building name, number, street, town, county, and geocoordinates.

Royal Mail PAF · East of England

CO Postcode — Colchester

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

Postcode District

CO — Colchester

Area

East of England

Region

Royal Mail PAF

Data Source

Postcode Lookup — CO DistrictSample

{
  "_note": "Sample response — enter any postcode above and click Lookup for live data",
  "status": 200,
  "result": {
    "postcode": "CO 1AA",
    "quality": 1,
    "eastings": 602412,
    "northings": 275452,
    "country": "England",
    "nhs_ha": "East of England",
    "longitude": 0.8916,
    "latitude": 51.932,
    "european_electoral_region": "East of England",
    "primary_care_trust": "Colchester",
    "region": "East of England",
    "lsoa": "Colchester 001A",
    "msoa": "Colchester 001",
    "incode": "1AA",
    "outcode": "CO",
    "parliamentary_constituency": "Colchester",
    "admin_district": "Colchester",
    "parish": "Colchester, unparished area",
    "admin_county": "East of England",
    "admin_ward": "Colchester Central",
    "ced": null,
    "ccg": "NHS East of England",
    "nuts": "Colchester",
    "codes": {
      "admin_district": "E07000000",
      "admin_county": "E10000000",
      "admin_ward": "E05000000",
      "parish": "E43000000",
      "parliamentary_constituency": "E14000000",
      "ccg": "E38000000",
      "lsoa": "E01000000",
      "msoa": "E02000000"
    }
  }
}

About the CO Postcode District

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

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

The wider Colchester postcode area (CO) also covers: Clacton-on-Sea, Harwich, Mersea Island, Halstead.

Frequently Asked Questions

What area does the CO postcode cover?

The CO postcode district covers Colchester in Colchester, East of England, England. It is one of 14 districts in the CO postcode area.

How do I look up all addresses in the CO 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 CO. The API returns all Royal Mail PAF addresses as structured JSON.

Is CO a valid UK postcode district?

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

CO Postcode — Colchester

About the CO Postcode District

Frequently Asked Questions

Other Colchester Postcode Districts