
It makes sense that the term ZIP code would be related to being zippy, which means “lively” or “peppy.” However, the USPS intentionally chose the acronym to indicate that mail travels more quickly when senders mark the postal code on their packages and envelopes. ZIP is an acronym for Zone Improvement Plan. But have you ever thought about what ZIP codes actually are? Beyond the cultural cachet of knowing (or even living in) “90210,” we don’t typically memorize them beyond our home addresses, so we tend to overlook the importance of those five digits. The 470,000 employees who work for the USPS (including the 7,000 on the Fleet of Feet delivering mail on foot) rely heavily on the five- or nine-digit ZIP codes for efficient and reliable mail delivery. But USPS workers are busy year-round: postal employees process a whopping 181.9 million of pieces of first-class mail per day!

The busiest time of year for the US Postal Service coincides with the December holiday season, when we’re all busy mailing greetings and gifts alike.
