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Between 1940 and 1960, mail volume in the US doubled due to automated mailings by companies. This overwhelmed postal workers, leading to the creation of the Zone Improvement Plan in 1963, dividing the country into ten regions with five-digit zip codes. The system was promoted with a cartoon character, Mr. ZIP, and a song by The Swingin Six, resulting in 83% of Americans using zip codes by 1969.