Mr. ZIP, who has no first name, appeared in many public service announcements and advertisements urging postal customers to use the five-digit ZIP Code that was initiated on July 1, 1963. Within four years of his appearance, eight out of ten Americans knew who Mr. ZIP was and what he stood for.

* | Tags: Fun facts History USPS Fact #754 | April 16, 2024

With the introduction of the nine-digit ZIP Code, or ZIP+4, in 1983, Mr. ZIP went into partial retirement. His image still was printed on the selvage of some sheets of stamps, but that practice ended in January 1986. Mr. ZIP still is used occasionally by the Postal Service.