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Between 1940 and 1960, the 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. The plan divided the country into regions with five digits zip codes for accurate mail delivery. The promotion of this system included a character named Mr. ZIP and a song by The Swingin Six. By 1969, 83% of Americans were using zip codes.