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Between 1940 and 1960, the mail in the US doubled as companies used computers for automated mailings. 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 made mail sorting easier. The government promoted the system with Mr. ZIP and a song from The Swingin Six. By 1969, 83% of Americans were using zip codes.