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Hey guys,
Hope this is the right place for this!
I was looking for a list of all cities in the United States with their postcodes, any of you guys know of any free sources for this?
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Try Google
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I came upon Postcodezip after looking for a while as well. https://www.Postcodezip.com includes a single database with all that data and more from many countries including France.
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US Zip Codes +4 are under direct control of the gov't USPS. As new post offices come on and old ones close, the USPS is the only reliable authority.