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

Redundancy. If someone has terrible handwriting, a postal worker might not be able to tell the difference between a letter meant to go to, for example, Duxbury vs Roxbury. But since Duxbury is 02332, and Roxbury is 02119, it clears up any ambiguity.