Product
Postcode lookup API
Turn a UK postcode into a complete, structured list of addresses in a single request. The Locatebase postcode lookup API is fast, accurate, and built for production.
What is a postcode lookup API?
A postcode lookup API takes a UK postcode and returns every deliverable address at that postcode as structured data. Instead of asking users to type their full address, you let them enter a postcode and pick from the results.
How it works
- Send a postcode — Make a GET request with the postcode and your API key.
- Get structured addresses — Receive a clean JSON list of matching addresses.
- Use the data — Populate forms, validate input, or enrich records.
Why developers choose Locatebase
- Fast — 75ms average response keeps experiences snappy.
- Reliable — 99.9% uptime guarantee for production workloads.
- Simple — One endpoint, predictable JSON, clear errors.
Frequently asked questions
What does a postcode lookup return?
It returns the list of addresses associated with a given UK postcode, each broken into structured fields such as address lines, town, and postcode.
Which addresses does Locatebase cover?
Locatebase provides comprehensive UK address and postcode coverage, kept current so your lookups stay accurate.
How much does Locatebase cost?
Locatebase uses simple monthly plans from £19/month, each with an included lookup allowance. Need more? Extra lookups are billed automatically from 2p each, depending on your plan. See the pricing page for current plans.