Zipsilo - United States
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What is ZIP?
A ZIP Code is a postal code used by the United States Postal Service (USPS), and the term ZIP is an acronym for Zone Improvement Plan. It was introduced in 1963, and the basic format is composed of five digits. As the ZIP Code is widely used, it is extended to nine digits to improve the efficiency of mail delivery. However, the five-digit ZIP Code is used more frequently in people's daily life.