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Between 1940 and 1960, mail volume doubled in the United States due to businesses using computers for automated mailings. This overwhelmed postal workers, leading to the implementation of the Zone Improvement Plan in 1963. This plan divided the country into regions with specific zip codes, making it easier to sort and deliver mail. The government promoted this system with a cartoon character named Mr. ZIP and a song from The Swingin Six. By 1969, 83% of Americans were using zip codes.