50 years ago, the U.S. Postal Service introduced the zip code system to more efficiently and accurately deliver mail. But not everyone was excited about the idea.

ZIP codes are a big reason our postal system works today, but it took years and a cartoon for the system to actually be adopted. Where did the coding system come from and why was it introduced ...

Wednesday marks the 52nd birthday of the introduction of ZIP codes in the US. Though the explosion of business mail is mostly responsible for the Zoning Improvement Plan (ZIP), the idea started ...

Call your post office with the ZIP Code numbers you need, and use them here and here for the fastest possible mail delivery. Remember, only you can put ZIP in your postal system.

The USPS has nearly 42,000 ZIP codes. The ZIP code system went into effect in 1963. The easternmost ZIP codes in New England start with a 0.

One mayor told Newsweek his community has seen "confusion" in the mail system under its current zip codes.