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I am building an web app (with PHP) that requires users to subscribe. I would like for them to identify where they are from. So what is the best way to validate there country/state(or province)/city/postal code? Is there a DB with all the information? Which one is the best?
Use the Google Geocoding API They allow 2,500 requests per day and you can pay for more. It will take an address and give you very detailed information on it and provide validation if you code it into your application.