How many addresses are in the KT21 postcode?

The KT21 postcode district covers Kingston upon Thames in Kingston upon Thames. The exact address count can be retrieved via the APITier Postcode Lookup API.

How do I look up addresses in KT21 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 KT21. The response returns all PAF addresses as structured JSON including building name, number, street, town, county, and geocoordinates.

Royal Mail PAF · London

KT21 Postcode — Kingston upon Thames

Q: What area is the KT21 postcode in?

KT21 is a postcode district in Kingston upon Thames, Kingston upon Thames, London, England. It is part of the KT postcode area.

KT21 is a postcode district in Kingston upon Thames, Kingston upon Thames, London, England. Use the lookup below to explore addresses within this postcode district.

KT21

Postcode District

KT — Kingston upon Thames

Area

London

Region

Royal Mail PAF

Data Source

Postcode Lookup — KT21 DistrictSample

{
  "_note": "Sample response — enter any postcode above and click Lookup for live data",
  "status": 200,
  "result": {
    "postcode": "KT21 1AA",
    "quality": 1,
    "eastings": 516452,
    "northings": 214358,
    "country": "England",
    "nhs_ha": "London",
    "longitude": -0.3364,
    "latitude": 51.3816,
    "european_electoral_region": "London",
    "primary_care_trust": "Kingston upon Thames",
    "region": "London",
    "lsoa": "Kingston upon Thames 001A",
    "msoa": "Kingston upon Thames 001",
    "incode": "1AA",
    "outcode": "KT21",
    "parliamentary_constituency": "Kingston upon Thames",
    "admin_district": "Kingston upon Thames",
    "parish": "Kingston upon Thames, unparished area",
    "admin_county": null,
    "admin_ward": "Kingston upon Thames Central",
    "ced": null,
    "ccg": "NHS London",
    "nuts": "Kingston upon Thames",
    "codes": {
      "admin_district": "E07000000",
      "admin_county": "E99999999",
      "admin_ward": "E05000000",
      "parish": "E43000000",
      "parliamentary_constituency": "E14000000",
      "ccg": "E38000000",
      "lsoa": "E01000000",
      "msoa": "E02000000"
    }
  }
}

About the KT21 Postcode District

The KT21 postcode district is part of the Kingston upon Thames (KT) postcode area, covering Kingston upon Thames and surrounding areas in London, England.

Postcodes in the KT21 district follow the format KT21 nXX where n is a digit and XX are letters. Each inward code identifies a specific delivery walk within the district.

The wider Kingston upon Thames postcode area (KT) also covers: Surbiton, New Malden, Esher, Leatherhead, Epsom.

Frequently Asked Questions

What area does the KT21 postcode cover?

The KT21 postcode district covers Kingston upon Thames in Kingston upon Thames, London, England. It is one of 24 districts in the KT postcode area.

How do I look up all addresses in the KT21 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 KT21. The API returns all Royal Mail PAF addresses as structured JSON.

Is KT21 a valid UK postcode district?

Yes. KT21 is a Royal Mail postcode district in Kingston upon Thames, England. Full UK postcodes in this district follow the format KT21 followed by a digit and two letters (e.g. KT21 1AA).

KT21 Postcode — Kingston upon Thames

About the KT21 Postcode District

Frequently Asked Questions

Other Kingston upon Thames Postcode Districts