UK Address Search & Validation

A simple JSON API to query UK postcodes and addresses

The most up-to-date & accurate UK dataset available

Starts at 2.5p per lookup & open data is free

Simply Priced

Worry-free pricing with no hidden costs or lock-in. A flat, pay-as-you-go rate of 2.5p per lookup

Incredibly Accurate

Access the UK's most accurate and up-to-date address database from Royal Mail, updated daily

Well Supported

Simple integration with clear documentation, open-source libraries and live support from developers

Access the most accurate address dataset in the UK

Updated daily by thousands of postmen and women, Royal Mail's Postcode Address File (PAF ®) provides the most accurate and up-to-date address dataset available in the UK

Address updates are retrieved daily so you won't miss a premise

Trusted by Many

We work with developers across small businesses and startups through to public and FTSE 100 organisations

Developers. Postcode lookups need not be so painful. The guys at @IdealPostcodes have a great API and are really helpful. Plus jQuery plugin
Stephen England (@StephenEngland)

@IdealPostcodes Bravo guys - 60 mins from "Hm, I should add postcode lookups" to being live in production on @Thread
Chris Lamb (@lolamby)

Shout out to @IdealPostcodes, great service, great documentation 💞
Tom Sansome (@tomsansome)

Awesome support and service from @IdealPostcodes - does one thing, well.
paul pod (@paulpod)

Business Operators

We were drawn to the ease of use and simplicity together with excellent documentation. The support has been friendly, expert and timely. We'd have no hesitation in recommending Ideal Postcodes for your next project

Ceri Richmond
Managing Director, Core

The team was brilliant start to finish making integration and setup so easy! The ability to contact someone who is technical is just brilliant and makes such a refreshing change

Andrew Board
Managing Director, Screwsline

Backed by simple API Methods

Postcode Lookup Address Search Autocomplete

Integrate postcode lookups with any form in moments

Add postcode lookups to any web form by embedding and configuring our jQuery Plugin

Demo HTML JavaScript

 1<!-- Add a div to house your 
 2     postcode input field -->
 3<div id="lookup_field"></div>
 4
 5<!-- This is your existing form -->
 6<label>Address Line One</label>
 7<input id="first_line" type="text" />
 8
 9<label>Address Line Two</label>
10<input id="second_line" type="text" />
11
12<label>Address Line Three</label>
13<input id="third_line" type="text" />
14
15<label>Post Town</label>
16<input id="post_town" type="text" />
17
18<label>Postcode</label>
19<input id="postcode" type="text" />

 1<script>
 2// Add this after your form
 3$('#lookup_field').setupPostcodeLookup({
 4  // Add your API key
 5  api_key: 'ak_hk71kco54zGSgVf9ExxRVVNmolLNh',
 6  // Identify your fields with CSS selectors
 7  output_fields: {
 8    line_1: '#first_line',  
 9    line_2: '#second_line',         
10    line_3: '#third_line',
11    post_town: '#post_town',
12    postcode: '#postcode'
13  }
14});
15</script>

Demonstrations limited to 15 lookups per IP, per day

See more examples · Read the documentation · See the code

Or integrate with address autocomplete

Add address autocomplete to any input field with our Autocomplete Plugin

Demo HTML JavaScript

 1<input id="input" type="text" 
 2  placeholder="Search for an address with autocomplete" />
 3<!-- Create an input field to attach autocomplete -->
 4
 5<!-- Below are your existing input fields -->
 6<label>Address Line One</label> 
 7<input id="first_line" type="text" />
 8
 9<label>Address Line Two</label>
10<input id="second_line" type="text" />
11
12<label>Address Line Three</label>
13<input id="third_line" type="text" />
14
15<label>Post Town</label>
16<input id="post_town" type="text" />
17
18<label>Postcode</label>
19<input id="postcode" type="text" />

 1var controller = new IdealPostcodes.Autocomplete.Controller({
 2  api_key: "iddqd",
 3  inputField: "#input",
 4  outputFields: {
 5    line_1: "#first_line",
 6    line_2: "#second_line",
 7    line_3: "#third_line",
 8    post_town: "#post_town",
 9    postcode: "#postcode"
10  }
11});