Address Lookup API Postcoder provides the fastest, most reliable way to capture accurate addresses

Ensure data quality and create the best user experience.

Postcode to address lookup

Postcoder enables people to use their postcode to lookup and fill in their address. Postcode lookup is up to 80% faster than typing an address manually. Automatic address verification provides addresses that are 100% up to date and postally correct.

Predictive address autocomplete

Postcoder suggests valid addresses to people as they type their address or postcode. Address autocomplete is Google for addresses – instantaneous results and no button to click. Create a great user experience and capture verified addresses.

Our predictive autocomplete can handle a multitude of human errors

Extra spaces
Birch Wood Drive (for Birchwood Drive)
Missing spaces
Fieldacre Way (for Field Acre Way)
Common typos
Queens Road Notingham (for Queens Road Nottingham)
Phonetic spellings
Tourkey Marina (for Torquay Marina)
Abbreviated words
Roman Rd (for Roman Road)
Transposed characters
Liecester Street (for Leicester Street)

Illustration example of how Postcoder's address lookup api predictive autocomplete can handle extra spaces.

Illustration example of how Postcoder's address lookup api predictive autocomplete handles missing spaces.

Illustration example of how Postcoder's address lookup api predictive autocomplete handles common typos.

Illustration example of how Postcoder's address lookup api predictive autocomplete handles phonetic spellings.

Illustration example of how Postcoder's address lookup api predictive autocomplete handles abbreviated words.

Illustration example of how Postcoder's address lookup api predictive autocomplete handles transposed characters.

Addresses with map coordinates

Postcoder provides geographic coordinates for postcodes and addresses. Use them to show your customers on a map or to calculate an optimised delivery route.

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Powered by a best-in-class address platform

Postcoder is refreshed daily using the most up-to-date and comprehensive data straight from official sources including Royal Mail and Ordnance Survey.

30M+ Addresses

1.8M Postcodes

1.4M Business names

4,500 Updates every day

Secure & resilient

Postcoder is hosted on a secure and reliable cloud platform in the UK and Ireland.

Secure HTTPS connection
GDPR compliant data processing
99.99% API uptime
350ms real-world response time

Postcoder's address lookup api has a secure and resilient dataset

Multiple datasets

Postcoder aggregates the data from multiple datasets to ensure it always provides the richest, most detailed address records.

Postcode Address File (PAF)
Multiple Residence
Alias
Not Yet Built
British Forces Post Office
AddressBase for UPRN lookup

Postcoder also works internationally using data from a wide range of global data suppliers.

An optimised developer experience

API keys are used for authentication and results are returned in JSON and XML formats.

Developer Docs

Postcoder has client libraries for:

[
	{
		"summaryline":"Allies Computing Ltd, Manor Farm Barns, Fox Road, Framingham Pigot, Norwich, Norfolk, NR14 7PZ",
		"organisation":"Allies Computing Ltd",
		"buildingname":"Manor Farm Barns",
		"premise":"Manor Farm Barns",
		"street":"Fox Road",
		"dependentlocality":"Framingham Pigot",
		"posttown":"Norwich",
		"county":"Norfolk",
		"postcode":"NR14 7PZ"
	}
]

<Addresses xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<Address>
		<summaryline>
		Allies Computing Ltd, Manor Farm Barns, Fox Road, Framingham Pigot, Norwich, Norfolk, NR14 7PZ
		</summaryline>
		<organisation>Allies Computing Ltd</organisation>
		<buildingname>Manor Farm Barns</buildingname>
		<premise>Manor Farm Barns</premise>
		<street>Fox Road</street>
		<dependentlocality>Framingham Pigot</dependentlocality>
		<posttown>Norwich</posttown>
		<county>Norfolk</county>
		<postcode>NR14 7PZ</postcode>
	</Address>
</Addresses>

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Having Postcoder on our checkout page has really helped ... Customers spend much less time adding their details which in turn made for a much more pleasant transaction.

Alex Woods
Digital Marketing Executive at Victorian Plumbing

Free support

Our sales and support teams are with you every step of the way. We listen carefully and communicate honestly. We don't use scripts or automated call systems. We have real people ready to help when you need it.

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Tracking usage

Understanding how your account is being used is important, so we make it easy for you. You can view usage reports, configure email alerts and check your remaining credit balance.

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