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For $40 these guys have something that also includes area code, time zone and is recent data & quick download, if that matters for your project:

http://zipcodedownload.com/Products/Product/Z5Commercial/Sta...

Regions for states is not something well defined, at least that I've found, as the definition varies depending on purpose (commerce, agriculture, political, ...). If you find something good, I'd love to hear about it.

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for region to states, I found this - http://www.infoplease.com/ipa/A0770177.html

Let me know if that is what you were looking for

Hi hhimanshu - I totally mis-understood what you meant - if you were looking to group states into national regions, your link looks pretty good. I was thinking of regions in terms of grouping counties into logical/meaningful state regions. I do that thus far for CA and NY where in each I have about 10 regions.

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