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I'm looking to purchase a dataset (with a contract for updates) of postal codes to lat/long and city names for as much of the world as possible. Ideally the data would look like:
country_code postal_code lat long city
US 90404 34.0019 118.2853 Santa Monica
Where is the best place to get this data?
You will find these data here: www.geopostcodes.com
like the previous answer this is also a commercial provider: DDS digital data services GmbH, based in Karlsruhe, Germany offers postcode data for most of the world. Much of their data targets at geomarketing applications and thus offers even subunits of postalcodes. http://www.ddsgeo.com/products/postal-boundaries.html
You would not get data in this level of detail anywhere for free. However I think postcode data for some countries is also included in OpenStreetMap. I think they use the tag boundary=postal_code for this.
