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.

Your billing zip code, or credit card postal code, is the five-digit number on the bottom right, which in this sample is 90210. This would be the zip code associated with your billing address. It ...

Where you live is closely linked with your health and longevity. These maps show how zip code influences health and life expectancy.