I need to be able to validate a user's location. For this I was hoping there was a database of cities I could use. I don't mind paying for it.<p>Does anyone know of a good database of cities, states and zip codes? Only need Us but if world or even multiple countries were available that would be nice.<p>Another possibility that would be nice is if I could simply check the location against Google or Facebook but couldn't find any API for this. Maybe someone could point me in the right direction?
USPS has an API: <a href="http://www.usps.com/webtools/address.htm" rel="nofollow">http://www.usps.com/webtools/address.htm</a>
Census.gov has downloadable data: <a href="http://www.census.gov/geo/www/tiger/tigermap.html#ZIP" rel="nofollow">http://www.census.gov/geo/www/tiger/tigermap.html#ZIP</a>