Address Finder API for Postcode & Address Autocomplete
Add fast UK address search, postcode lookup and address autocomplete to your website, web app, desktop software or bespoke business system using the Simply Postcode Address Finder API.
Address Finder API flow
Build postcode lookup, address finder and address autocomplete into almost any programming stack.
Choose the right Address Finder API option
Simply Postcode provides modern and legacy API options for developers who need UK address lookup, postcode search, address autocomplete or Royal Mail PAF address data integration.
Best for: web app devs.
The recommended Address Finder API for new integrations. Search by postcode, postcode plus address words, or search-as-you-type text.
- Search as you type, postcode or part address
- Open API call
- Full address search
- Returns JSON Full address and geo-location information
- Returns geo-location information
- Good for checkout/signup pages
- Returns location information
Best for: Quick integration
A fast website address finder option for adding UK address autocomplete to web forms with minimal coding.
- Search as you type, postcode or part address
- Simple HTML setup
- Add one line of code
- No server technology required
- Very good mobile experience
- Use wizard to map fields
- Returns geo-location information
Legacy API Options
Legacy API options are available for older systems, Windows applications and bespoke software that needs established integration methods.
Build address lookup into websites, apps and business systems
Use the Address Finder API to let users search by postcode, partial address or typed words, then return a selected Royal Mail address record with structured address fields and geolocation.
Address Finder API features
Everything you need to add UK postcode lookup, address search and address autocomplete to your own software.
Royal Mail PAF data
Use address data based on Royal Mail PAF for accurate UK address capture.
Modern JSON Open API
Use the V3 Open API with modern websites, web apps and desktop applications.
Postcode and word search
Search by postcode, partial address, or search-as-you-type address words.
Geolocation included
Return address details with geolocation data when retrieving the selected address record.
Daily updated data
Address data is maintained for you, reducing the need to manage your own database.
UK technical support
Get support from a UK software company used to helping developers and business users.
Two-call address lookup process
The recommended V3 Address Finder API uses a simple search and retrieve process. First search for matching addresses, then retrieve the selected full address record.
- Search using postcode, postcode plus words, or search-as-you-type text
- Display matching address options to the user
- Retrieve the selected full address record and geolocation
- Populate your web form, app screen, CRM, ERP or business database
Good fit for:
- Website checkout address lookup
- Address autocomplete on signup forms
- CRM and customer portals
- Accounting and ERP systems
- Desktop business applications
- Bespoke web and mobile applications
What is an Address Finder API?
An Address Finder API is a developer interface that lets software search for, validate and retrieve postal addresses. Simply Postcode provides a UK Address Finder API for postcode lookup, Royal Mail PAF address search, address autocomplete and structured address capture in websites, apps and business systems.
Developers can use the Simply Postcode Address Finder API to search for a UK address, present matching results to a user, retrieve the selected address, and populate address fields automatically.
Important keywords covered
- Address Finder API
- Royal Mail Address Finder API
- Postcode Lookup API
- UK Address Autocomplete API
- JSON Address Lookup API
- PAF Address Finder
Why choose Simply Postcode for address lookup?
Quick to integrate
Use examples and API options to get postcode lookup working quickly.
Reliable service
Designed for business use, with the site stating over 99.99% availability.
No setup charges
Start with a trial and choose the package that fits your website, app or business system.
Desktop options
COM Object and .NET Assembly options are available for Windows desktop software.
Website options
Use API integration or SimplyCompleteAI to add address finder functionality to web forms.
Developer options
Choose modern or legacy API routes depending on your technology stack.
Ready to add an Address Finder API to your software?
Start a free trial, view the V3 Open API documentation, or request a quote for your website, app or bespoke business system.
Prefer to talk? Call us on 01945 464854