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Re:Redis 3.2.0 is out by hamandcheese on Friday May 06, 2016 @08:28AM (#11643450)
The incomplete zips (for at least one database I've read about) come from corporate or industrial areas where not many people actually live.
Re:Redis 3.2.0 is out by maxerickson on Friday May 06, 2016 @08:56AM (#11643607)
Officially US zip codes are just collections of addresses, they don't necessarily correspond to areas.

I think most free datasets are probably just the areas that Census derived for TIGER (or at the very least, rely heavily on that data).