PASAR API

🇬🇧 Postcodes.io ~ UK postcode geocoding API

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Free and open-source, no key; converts UK postcodes to lat/long plus admin geography (built on ONS/OS open data) and is self-hostable.

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# Postcodes.io ~ UK postcode geocoding API is a free portal hosting multiple APIs.
# Browse the available endpoints at:
# https://postcodes.io/

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Postcodes.io ~ UK postcode geocoding API (Ideal Postcodes (open-source project)) is a free United Kingdom data portal with multiple APIs. Docs: https://postcodes.io/

Source: Ideal Postcodes (open-source project) (https://postcodes.io/)
Source type: Official portal or provider docs
Endpoint type: Portal or multi-endpoint API
Integration difficulty: Choose endpoint
Last checked: 2026-07-05
Production caveat: Pick the exact endpoint first. Portal datasets can vary by format, parameters, access rules, and coverage.

Help me pick the right endpoint for my use case, verify access/format/coverage, and fetch it without assuming every dataset is copy-paste-ready.

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