Address Lookup API

Fast and accurate address lookup

Postcoder provides a fast and accurate way for people to fill-in their address on your website and app. Reduce customer frustration and enhance data quality by adding international address lookup to your form. Supports 249 countries.

Start a Free Trial

Trusted by leading organisations worldwide

Speed and accuracy

5x faster address completion with zero typos

Postcoder creates a streamlined and accurate address capture experience on your form by condensing five fields into one. This results in faster checkouts and addresses with no spelling mistakes.

Address autocomplete

Postcoder address autocomplete helps your customers by providing real-time suggestions as they're typing their address or postcode.

Delivers instant as-you-type results
Provides an intuitive search experience
Includes worldwide address coverage

Start a Free Trial

GET https://ws.postcoder.com/pcw/autocomplete/find?PCW45-12345-12345-1234X&query=123%20foxg&country=uk&format=json
[
	{
		"id": "10101010",
		"type": "ADD",
		"summaryline": "123 Foxglove Close",
		"locationsummary": "Weybourne, Holt, Norfolk, NR25 7HG",
		"count": 1
	},
	{
		"id": "20202020",
		"type": "ADD",
		"summaryline": "123 Foxglove Lane",
		"locationsummary": "Biddenden, Ashford, Kent, TN27 8BT",
		"count": 1
	},
	{
		"id": "30303030",
		"type": "ADD",
		"summaryline": "123 Foxglove Road",
		"locationsummary": "Winchburgh, Broxburn, West Lothian, EH52 6FE",
		"count": 1
	}
]

Address and postcode lookup

Postcoder makes it easy for your customers to fill in their address using their postcode or the key parts of their address.

Accepts postcodes and partial addresses
Uses a single API call
Includes worldwide address coverage

Start a Free Trial

GET https://ws.postcoder.com/pcw/PCW45-12345-12345-1234X/address/uk/tn27%208bt?lines=2&format=json
[
	...
	...
	{
		"addressline1": "123 Foxglove Lane",
		"addressline2": "Biddenden",
		"summaryline": "123 Foxglove Lane, Biddenden, Ashford, Kent, TN27 8BT",
		"number": "123",
		"premise": "123",
		"street": "Foxglove Lane",
		"dependentlocality": "Biddenden",
		"posttown": "Ashford",
		"county": "Kent",
		"postcode": "TN27 8BT"
	}
	...
	...
]

Single ground truth

The most comprehensive address data in one API

Using advanced matching algorithms and data cleansing techniques, Postcoder links related information from multiple official sources to provide a detailed description of each address. The result is a unified view and single ground truth that you can rely on.

Postal addresses
Map coordinates
Updated daily

Postcode Address File (PAF)

Royal Mail's definitive UK address database.

Learn more about the PAF dataset

Eircode

Ireland's postal code system enables people and businesses to find every address in the country.

Add Eircode to your address lookup

ONS Postcode Directory

The Office for National Statistics assigns geographies to postcodes using the ONS Postcode Directory.

Add geospatial data to your postcodes

United States Postal Service

A standardised format of US addresses to access US address lookup and delivery point validation services.

Discover USPS ZIP+4 data

HERE Technologies

Over 100,000 sources provide the freshest, most accurate digital representation of the world.

Find out more

Start a Free Trial

Global data, global scale

Address lookup on a global scale

Postcoder delivers the scale you need for global commerce. Approaching 1 million requests per day, it delivers lightning quick response times and supreme reliability wherever your customers are based.

249
countries for address lookup
700k+
API requests per average day
99.99_%
historical uptime

View the Status Page Start a Free Trial

Highly rated by customers

An award-winning API with top-tier performance, easy admin and great support

Customers love Postcoder according to independent user reviews on the world's most trusted software marketplace. Start a free trial and find out what you've been missing.

Simple, straightforward and easy to integrate

Start a Free Trial

Designed for developers

An optimised developer experience

Get up and running with address lookup in minutes using the quick start guide, sample code and API docs.

Get started for free
Retain your existing form layout
Customise response fields and address lines
Get 100% free support over live chat, email and telephone

Read the Docs Start a Free Trial

address.js

address.py

address.php

address.cs

// Prepare request
let url = `https://ws.postcoder.com/pcw/autocomplete/retrieve?apikey=${key}`;
// Retrieve address selected by user
url += `&id=${address_id}&query=${user_input}&country=${country_code}`;
// Fit address into 2 lines
url += `&lines=2`;
// Add extra fields
url += `&addtags=longitude,latitude`;
// Return JSON ♥
url += `&format=json`;
// Tag the request for easy reporting
url += `&identifier=checkout`;

GET https://ws.postcoder.com/pcw/autocomplete/retrieve?
apikey=PCW45-12345-12345-1234X&id=20202020&query=123%20foxg
&country=uk&lines=2&addtags=latitude,longitude
&format=json&identifier=checkout   
{
	"addressline1": "123 Foxglove Lane",
	"addressline2": "Biddenden",
	"summaryline": "123 Foxglove Lane, Biddenden, Ashford, Kent, TN27 8BT",
	"number": "123",
	"premise": "123",
	"street": "Foxglove Lane",
	"dependentlocality": "Biddenden",
	"posttown": "Ashford",
	"county": "Kent",
	"postcode": "TN27 8BT",
	"latitude": "51.1024521653",
	"longitude": "0.6645798746"
}

Simplified admin

Buy credits, check usage and configure security with ease

Use the feature-rich admin area to set up and manage your account. It is natively mobile and desktop-friendly so whether you're updating a setting on the go or doing a deep-dive at your desk, it will be the same seamless experience. It supports dark mode too.

Start a Free Trial

Powerful customer stories

Postcoder is trusted by over 9,000 organisations of all sizes

Postcoder helps organisations in the UK and worldwide achieve measurable improvements in their form conversions and data quality. After integrating Postcoder, many of them report increased onboarding numbers, faster form completion, and a surge in quality leads. Postcoder captures contact details you can rely on.

Read Customer Stories Start a Free Trial

We picked Postcoder because the API is simple to use and it supports many countries which we want to scale out to.
David Annez, Loveholidays

Fast and accurate address lookup

5x faster address completion with zero typos

Address autocomplete

Address and postcode lookup

The most comprehensive address data in one API

Postcode Address File (PAF)

Postcoder enriches PAF with these additional datasets from Royal Mail...

Multiple Residence

Alias

Not Yet Built

British Forces Post Office

Eircode

ONS Postcode Directory

United States Postal Service

HERE Technologies

AddressBase Core

AddressBase Premium

Address lookup on a global scale

An award-winning API with top-tier performance, easy admin and great support

Simple, straightforward and easy to integrate

An optimised developer experience

Buy credits, check usage and configure security with ease

Postcoder is trusted by over 9,000 organisations of all sizes