A few cover multiple states.

See: https://peter-horton.com/2022/12/30/zip-codes-zctas-and-zcta...

I think that can solved using a city dropdown there’s ambiguity.

This is not new. Some checkouts do start with zip code and they feel much more efficient. (US only delivery, so country already assumed)

Yeah, but autofilling everything down to the neighboring city is still a huge improvement.