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

because even the postpeople usually don’t memorize all the zip codes and at the last mile, it’s really helpful.

also because people do typos, it’s a redundancy to make stuff easier