Here's what to know on how to address an envelope, write a return address, find a zip code, send letters internationally and figure out which stamps are best.

A postal code is a five digit code used to help postal services deliver mail and packages. Here's what the numbers mean and how they determine yours.

Green officials say the current system, which splits the city between multiple postal codes, creates tax collection problems ...

WHATELY — Come Jan. 1, all addresses in Whately will be unified under ZIP code 01093.