As far as I know, that includes all of the zip codes in the US. Some will say that there are more than 70,000, but that's not entirely true.
In my case:
48315 is my zip code. But that zip code is used in Utica, and in Shelby Twp (where I live).
If I look up my zip code, it's in the database, but only listed as Utica. Some databases would list it twice, once with each city name. Mine lists them once with the primary city. No duplicates.
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