First Stamp with Mr. Zip in the Selvage
On January 10, 1964, Mr. Zip first appeared in the selvage of a stamp sheet honoring Texas icon Sam Houston.
Prior the creation of Zip codes, the US had postal districts or zones for use in larger cities. As towns and cities grew, the Post Office needed a more organized system to help separate the mail. In 1944, postal inspector Robert Moon submitted a proposal calling for a three-digit Zip code to help sort the mail. For this, Moon is often considered the father of the Zip Code, though it wouldn’t be implemented for nearly 20 years.