Zip Code

A ZIP Code (an acronym for Zone Improvement Plan[1]) is a system of postal codes used by the United States Postal Service (USPS). The term ZIP was chosen to suggest that the mail travels more efficiently and quickly[2] (zipping along) when senders use the code in the postal address... Because ZIP Codes are intended for efficient postal delivery, there are unusual cases where a ZIP Code crosses state boundaries. https://en.wikipedia.org/wiki/ZIP_Code