why do we need to use city and state in our addresses if ZIP codes are already linked to the city and state?

Question

why do we need to use city and state in our addresses if ZIP codes are already linked to the city and state?

In: 100

Answer 1

You don’t. In The Netherlands, if you post a letter with ZIP (4 digits + 2 letters) + housenumber, it gets delivered.

Everything else is backup.

It gets better: if you go to a postal office and tell them the zip+housenumber, they print an unreadible code and put that on your parcel/letter. No-one except the deliveryguy will know where the package is going.