A ZIP Code 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 when senders use the code in the postal address.
A 1974 postage stamp encouraging people to use the ZIP Code on letters and parcels
A 1963 U.S. Post Office sign featuring Mr. ZIP
A label inside a stamp booklet promoting the ZIP Code
Early advertisement for ZIP Code 10005
A postal code is a series of letters or digits or both, sometimes including spaces or punctuation, included in a postal address for the purpose of sorting mail.
Post office sign in Farrer, Australian Capital Territory, showing postcode 2607
1977 Soviet stamp promoting the use of postal codes