4 ms·
> Zip+4 codes also change frequently because they aren’t based on locations but on delivery routes and sequencing. This was news for me. I know the few zip+4 I
by fn-mote 8mo ago
> Zip+4 codes also change frequently because they aren’t based on locations but on delivery routes and sequencing.
This was news for me. I know the few zip+4 I memorize never change.
I think the source for the parent is AI slop. See [1].
> Due to an increase in population or to the improve postal operations, the US Postal Service® will occasionally add a new ZIP Code or change ZIP Code boundaries.
The plus four digits encode:
> [67] : Sector or Several Blocks
> [89] : Segment or One Side of a Street
Note that this contradicts the parent.
[1]: https://faq.usps.com/s/article/ZIP-Code-The-Basics https://faq.usps.com/s/article/ZIP-Code-The-Basics
- twodave 8mo agoThe census bureau (very) periodically publishes zip code data (which is where some places get their geolocation info). If you work with enough addresses you’ll find some zip+4s that are wildly far away from where they used to be. There are paid services that have better accuracy, but I’m not sure how they acquire their data.
- bombcar 8mo agoSome people don't realize just how much you can "customize" deliverability with the post office, especially if you're big (like a school or large business) - you can have something that looks like your physical address, but is actually really a maildrop/PO Box at the nearby post office. You can do relatively complex forwarding that would only appear to the end users if they can decode the barcode.