How many addresses are in the HP4 postcode?

The HP4 postcode district covers Hemel Hempstead in Hemel Hempstead. The exact address count can be retrieved via the APITier Postcode Lookup API.

How do I look up addresses in HP4 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 HP4. The response returns all PAF addresses as structured JSON including building name, number, street, town, county, and geocoordinates.

Royal Mail PAF · East of England

HP4 Postcode — Hemel Hempstead

Q: What area is the HP4 postcode in?

HP4 is a postcode district in Hemel Hempstead, Hemel Hempstead, East of England, England. It is part of the HP postcode area.

HP4 is a postcode district in Hemel Hempstead, Hemel Hempstead, East of England, England. Use the lookup below to explore addresses within this postcode district.

HP4

Postcode District

HP — Hemel Hempstead

Area

East of England

Region

Royal Mail PAF

Data Source

Postcode Lookup — HP4 DistrictSample

{
  "_note": "Sample response — enter any postcode above and click Lookup for live data",
  "status": 200,
  "result": {
    "postcode": "HP4 1AA",
    "quality": 1,
    "eastings": 513162,
    "northings": 253918,
    "country": "England",
    "nhs_ha": "East of England",
    "longitude": -0.3834,
    "latitude": 51.738,
    "european_electoral_region": "East of England",
    "primary_care_trust": "Hemel Hempstead",
    "region": "East of England",
    "lsoa": "Hemel Hempstead 001A",
    "msoa": "Hemel Hempstead 001",
    "incode": "1AA",
    "outcode": "HP4",
    "parliamentary_constituency": "Hemel Hempstead",
    "admin_district": "Hemel Hempstead",
    "parish": "Hemel Hempstead, unparished area",
    "admin_county": "East of England",
    "admin_ward": "Hemel Hempstead Central",
    "ced": null,
    "ccg": "NHS East of England",
    "nuts": "Hemel Hempstead",
    "codes": {
      "admin_district": "E07000000",
      "admin_county": "E10000000",
      "admin_ward": "E05000000",
      "parish": "E43000000",
      "parliamentary_constituency": "E14000000",
      "ccg": "E38000000",
      "lsoa": "E01000000",
      "msoa": "E02000000"
    }
  }
}

About the HP4 Postcode District

The HP4 postcode district is part of the Hemel Hempstead (HP) postcode area, covering Hemel Hempstead and surrounding areas in East of England, England.

Postcodes in the HP4 district follow the format HP4 nXX where n is a digit and XX are letters. Each inward code identifies a specific delivery walk within the district.

The wider Hemel Hempstead postcode area (HP) also covers: High Wycombe, Aylesbury, Amersham, Chesham.

Frequently Asked Questions

What area does the HP4 postcode cover?

The HP4 postcode district covers Hemel Hempstead in Hemel Hempstead, East of England, England. It is one of 21 districts in the HP postcode area.

How do I look up all addresses in the HP4 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 HP4. The API returns all Royal Mail PAF addresses as structured JSON.

Is HP4 a valid UK postcode district?

Yes. HP4 is a Royal Mail postcode district in Hemel Hempstead, England. Full UK postcodes in this district follow the format HP4 followed by a digit and two letters (e.g. HP4 1AA).

HP4 Postcode — Hemel Hempstead

About the HP4 Postcode District

Frequently Asked Questions

Other Hemel Hempstead Postcode Districts