US Zip Codes Database location

Hi,

Could someone point me best place to get the most valid US ZIP Codes database? We are planning to integrate into our User registration.

Thanks

Zipinfo.com sell a straight list showing city / state / zipcode for a one-off US$20. There might be similar products available for freee, but I’ve never come across any.

There are also websites offering individual look-ups for free, but I guess that won’t be useful for you, as you will be wanting to automate the process.

Hope this helps.

Mike