This map lists Portsmouth, NH as having the zip code 00210 - 00215, which... aren't valid zip codes. It does also show Portsmouth with the correct zip of 03801 - 03804. I wonder how that happened, and if there are any other weird errors? Honestly this is exactly the outcome I had wanted when I started smacking in codes starting with 000, then 001, and 002 actually had a little blip stayed highlighted so I investigated further.

It also has errors with the locations of ZIP Codes. 92018 is on the coast but it's shown as near Ramona CA. 92010 doesn't exist.