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I didn't know the answer so I looked it up. Nominatim gets postcodes from Ordnance Survey: https://nominatim.org/release-docs/3.4/data-sources/GB-Postcodes/ htt

I didn't know the answer so I looked it up. Nominatim gets postcodes from Ordnance Survey: https://nominatim.org/release-docs/3.4/data-sources/GB-Postcodes/ https://nominatim.org/release-docs/3.4/data-sources/GB-Postc... Specifically Code-Point Open: https://www.ordnancesurvey.co.uk/products/code-point-open https://www.ordnancesurvey.co.uk/products/code-point-open which is updated quarterly, and in turn gets the postcodes from Royal Mail.

moring 2y ago
It seems to me that you can download the postcode list freely: https://osdatahub.os.uk/downloads/open/CodePointOpen https://osdatahub.os.uk/downloads/open/CodePointOpen Something is missing here. If OS already has that data from RM and can make it available freely, why would they need to build another database?
- sahmeepee 2y ago
  Because the OS data doesn't provide addresses, just locations of the postcodes in coordinate terms, so you can't provide the typical website address lookup.