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I am working in a company where our team requirement is to do reverse geocoding lookups. Below is our requirement.

To give you more background, the 3 geolocation-related needs I have are as follows:

  1. Lat/Long lookup: returning country, city, state, region, postal code
  2. Address lookup: returning lat/long
  3. Postal Code lookup: returning country, city, state, region, lat/long (I assume the lat/long of the postal code’s centroid is what is usually provided)

Which provider can I look into which will fulfill my above needs? I am looking for something which is used worldwide and are more reliable in terms of accuracy and coverage.

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Postcode (alone) is going to be marginal at best, because they are not unique worldwide. For example, 1234 is a valid postcode at least Australia and the Philippines. – BradHards Jan 12 '13 at 4:11

I made good experience with nominatim.

Try this (College Park in Toronto)

lat long lookup address lookup

More examples can be found here examples. It is in German but the examples are self declarative.

I guess the premium product is googles map API. Therefore I mentioned just something which might be an alternative.

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If you are looking for a service, there is PickPoint. It engages nominatim and OSM for geocoding.

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