Only if there's never more than 10,000 addresses in a single zip code, which means that if you enforce that, you can force a zip code to appear by building enough house
That happens, and worse. I've lived in multiple areas that have had their zip code changed. Area codes, too, sometime more than once.
That happens, and worse. I've lived in multiple areas that have had their zip code changed. Area codes, too, sometime more than once.