A Cardiff postcode lookup instantly returns every deliverable address for a Cardiff postcode using Royal Mail's Postcode Address File (PAF), which holds around 31 million UK addresses across roughly 1.8 million postcodes. AutoPostcode returns Cardiff results in under 100ms, free to try with no card required.
Demo results — live API returns full Royal Mail PAF address lists.
How does Cardiff postcode lookup work?
A Cardiff postcode lookup matches a full or partial postcode against Royal Mail's Postcode Address File (PAF), the UK's official address database of around 31 million addresses across roughly 1.8 million postcodes. You type a Cardiff postcode, AutoPostcode returns every deliverable address at that location in milliseconds, and the user selects the correct one — no manual typing, no typos.
AutoPostcode's Cardiff data is drawn from the same national PAF file used by Royal Mail, so a lookup in Cardiff is as accurate as anywhere else in the UK. Integrate it through our postcode lookup API or drop the widget into any checkout with a few lines of code.
Which postcodes does Cardiff use?
Cardiff sits within the CF postcode area, from central districts CF10 and CF11 out to suburbs such as CF14 (Llanishen), CF24 (Roath) and CF5 (Ely). The wider CF area also covers the Valleys towns like Pontypridd and Merthyr Tydfil, all resolvable against Royal Mail PAF.
Why use AutoPostcode for Cardiff address lookup?
- Royal Mail PAF-backed data covering every deliverable Cardiff address
- Sub-100ms responses so checkout never stalls
- Simple, affordable pricing — a modern alternative to Loqate, Fetchify and Ideal Postcodes
- Developer-friendly REST API with drop-in front-end widget
- GDPR-compliant, UK-hosted lookups
How does AutoPostcode compare to other lookup tools?
| Feature | AutoPostcode | Typical incumbent |
|---|---|---|
| Data source | Royal Mail PAF | Royal Mail PAF |
| Cardiff coverage | Full | Full |
| Pay-as-you-go | Yes | Often minimums |
| Free trial | Yes, no card | Rarely |
| Setup time | Minutes | Hours/days |
Get started with Cardiff postcode lookup
Try the free lookup above, then wire AutoPostcode into your site with the UK address validation API for full validation, or the postcode lookup API for autocomplete. You can also explore the full product range to see nationwide coverage beyond Cardiff.
Ready to reduce failed Cardiff deliveries?
Accurate addresses cut returned parcels, delivery surcharges and abandoned carts. Start free and see how fast Cardiff postcode lookup can be.
Frequently asked questions
What is a Cardiff postcode lookup?
A Cardiff postcode lookup takes a Cardiff postcode and instantly returns every deliverable address at that location from Royal Mail's Postcode Address File (PAF), so users select their address instead of typing it.
Is the Cardiff address data accurate?
Yes. AutoPostcode uses the official Royal Mail PAF, covering around 31 million UK addresses across ~1.8 million postcodes, including every deliverable address across Cardiff and South Wales.
How fast is a Cardiff postcode lookup?
AutoPostcode returns Cardiff address results in under 100 milliseconds, keeping checkout and form autocomplete instant.
Which Cardiff postcode areas are covered?
The CF postcode area covers Cardiff, from central CF10–CF11 out to districts like CF14 (Llanishen), CF24 (Roath) and CF5 (Ely), plus neighbouring South Wales districts — all resolved via PAF.
Can I try the Cardiff lookup for free?
Yes. Use the free demo on this page, then start a free trial with no credit card to integrate it into your own site.
How do I add a Cardiff postcode lookup to my website?
Use the AutoPostcode postcode lookup API or drop-in widget — most sites integrate it in minutes with a few lines of code.
Ready to get started?
Add Royal Mail PAF-verified UK address lookup to your site in minutes — start free, no card required.