> it's just used for postal service Even then, to my understanding the USPS has for some time now not relied on zip codes at all. They have a really good addr

> it's just used for postal service Even then, to my understanding the USPS has for some time now not relied on zip codes at all. They have a really good address database, they match on that, and then stamp the mail with a routing barcode at the origin post office. The zip code is extra, mail flows just fine if you leave it off.