Everyone has memorized exactly two ZIP codes: 90210 and whatever their own ZIP code is. Why do we use zip codes? The entire practice of using ZIP codes is a relatively new system that was put in ...

People realize they can use ZIP codes for other purposes, like advertisers who want to do targeted marketing, which doesn't always work perfectly because ZIP codes define postal routes.

New USPS delivery standards could slow mail for some customers and speed it up for others. Here's what online shoppers need ...

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.

The humble ZIP Code shows up in all kinds of surprising places. Planet Money looks at how it was born, how it transformed the mail and talks to one researcher who argues that it's gone too far.