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.

Rent prices may feel high just about everywhere, but in some ZIP codes, they’re downright astronomical. RentCo analyzed more ...

Hochatown lost its ZIP code when the Army Corps of Engineers moved the town to construct Broken Bow Lake. Now, town officials ...