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

I know there’s a much more complex (and correct) answer than this, but ZIP codes aren’t 1:1 with cities. My city is a suburban one but has something like a dozen ZIP codes. They provide additional granularity and help route mail more efficiently, though leaving a ZIP code off of your mail will still result in your mail being delivered.