Gregory's Server@xssfox US Postal Codes have no real geo point. So building a “find nearest location” using postal codes was only as good as your dataset. Back when I was working on it. The coordinates were tied to the Post Office managing the postal code. So many headaches! And as someone else stated… taxes!
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@ingalls @xssfox correct as Google Maps became popular I noticed that a lot of the data providers were also “centering” the zip codes. But even that had issues as every 3 months I had to file a report with Google that the coordinates for a Staten Island, NY zip code was off by 20 miles north. That happened so frequently that I created a script to alert and adjust. |
@xssfox @jnunez Many datasets just use the midpoint of the zip code, which is fine in a city but in rural areas that midpoint might be 50 km away.