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Widespread adoption of the ZIP code can largely be attributed to a cartoon letter carrier.
The U.S. Postal Service introduced the Zone Improvement Plan as a means to more efficiently sort and route mail. According to the U.S. Postal Service Office of Inspector General, the five-digit code system was launched in 1963 but was based off of a system proposed in 1943. It divided up big...
https://www.freightwaves.com/news/where-did-the-zip-code-come-from