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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. The plan divided the country into ten regions with five-digit zip codes, improving mail sorting efficiency. The government promoted the new system with Mr. ZIP and a song by The Swingin Six. By 1969, 83% of Americans were using zip codes.