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I implemented a U.S. “find near zip code” search for somebody. The coordinates of U.S. zip codes come from a commercial zip code database. Now, they would like a similar ability for countries other than the U.S.
Has anybody implemented something like this for non-U.S. searches? How about general “find close to this address” searches? What commercial data is available?
See if GeoNames works for you:
http://www.geonames.org/
They’ve got a database of postal codes and another one of place names with coordinates. You could combine the two to get what you want.
I can’t say much more about this one, but they seem to offer a commercial database:
http://www.killetsoft.de/h_geod_e.htm