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Business > Business Issues How mail travels through the United States Postal Service system: 2 of 4

The United States Postal Service has been around for what seems like forever, so they've had a lot of practice delivering mail over the years. The primary way for mail to be delivered is based on the address. The most important part is the zip code, becasue those five numbers (and the four other numbers that follow after the dash, e.g. 92064-7071) give the post office a precise sector of your city and neighborhood in which to deliver your piece of mail. Most of their machines first distribute and sort mail based on the zip code on the envelope, since each zip code represents a distinct pla...
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