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Between 1940 and 1960, mail volume in the US doubled due to automated mailings by companies. To address the overwhelming flood of mail, the Postal Service introduced the Zone Improvement Plan in 1963. This system divided the country into ten regions with five-digit codes. The introduction of zip codes simplified mail sorting and delivery. The government promoted zip codes through Mr. ZIP and a catchy song by The Swingin Six, leading to 83% of Americans using zip codes by 1969.