Address lookup API

Capture accurate addresses and improve user experience

Data refreshed daily   Works internationally   Delivered as a web service

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UK and international address validation

Intelligent search

Optimised to handle typos, misplaced characters and even out-dated postcodes.

240+ countries

Allow your customers and employees to lookup an address anywhere in the world.

Quick setup

Install on a website or app in the same way as you integrate Google Maps or PayPal.

Reliable source data

Combines the very latest data from suppliers like Royal Mail, OS, Eircode and USPS.

Payment models

Pay for lookups in advance and use optional auto top-up, or pay monthly or yearly.


Supports HTTPS to ensure the addresses you lookup are encrypted from end to end.

Try the demo

See how it works with UK addresses

Designed for everyone

Our example UI conforms to Government Digital Service (GDS) accessibility guidelines

Screen enlarger using an accessible autocomplete UI example

Use PostCoder Web across your business

Checkout and registration forms

Use address lookup to help customers fill in their details more easily. Capture higher quality addresses from the start.

CRMs and office apps

Help your staff spend less time typing in addresses and more time concentrating on your customers and their needs.

EPOS systems

Speed-up customer refunds and improve address accuracy by including postcode lookup in your returns procedure.

Mobile apps

Improve usability on devices with smaller interfaces by using postcode lookup whenever you ask for an address.

Use PostCoder Web across your business

A simple API for developers

Sign up for an API key and get free lookups to try

Cross platform postcode lookup using the PostCoder Web API

Easy to integrate examples
Secure HTTPS requests
Reporting tools and usage alerts
350ms real-world response time
99.999% uptime
Enterprise SLA available

API documentation
Get your API key

9,000 businesses already trust us

“2x faster checkout times - PostCoder Web has literally transformed our checkout process”

- Zak Edwards, Founder of Prezzybox

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