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I wonder what database they are using for the ZIP codes. I tried googling around a bit and only found a bunch of "pay X$ to get all US ZIP codes". I'm pretty sure I've found these before for an ERP project I worked for...maybe the CIA? database (I distinctly remember they had some pretty good stuff)

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I thought there were plenty of those available freely.

Are these good enough? :

http://geocoder.ca/?freedata=1

US Zip Codes

File of all US 5-digit ZIP codes. Includes zip, city, state, latitude, longitude, and county (Last Updated: March 30th 2010):

US Zip Codes (41,755)

or

http://sourceforge.net/projects/zips/

Edit: MaxMind recommends this one

http://download.geonames.org/export/zip/

There's also Google's geocoding API.

Still, let's hope the project owners answer you :)

Not exactly.

"ZIP Codes are commercially sensitive... proprietary information"[1]

[1]: https://news.ycombinator.com/item?id=6685917

You can download the database that is used to update Wikipedia (bots do that job):

http://de.wikipedia.org/wiki/Wikipedia:WikiProjekt_Georefere...

3.54 million entries in 273 languages with Cities, GPS coordinates, ZIP codes, and a lot of more - all free and up-to-date. It's a project of German Wikipedia, but the website is in English and the data is used by all Wikipedia instances.

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