Hello,<p>Where can I get list of valid US zip codes for free? I found this list but I do not think it is accurate.<p>https://gist.github.com/dryan/7486408<p>For example, 34001 and 04857 are listed a valid in the above link but USPS says they are invalid zip codes. If I do not find a ready made list, I will have to use USPS api and check each zip code individually.
You might try some of the mass mailing utility vendors, zip code accuracy are key to getting good mail rates.<p>Edit: IIRC you can get a db and updates through USPS, its a subscription thing if you dig around you can find it.