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Between 1940 and 1960, the amount of mail doubled in The United States. Thats largely because companies began using computers to send automated mailings. Soon, the flood of mail sent by banks, advertisers, and other businesses was overwhelming postal workers. The Postal Service needed a solution. In 1963, the Zone Improvement Plan divided the country into ten regions and assigned five digits increasing in specificity, from region, to large sorting centers, to smaller post offices. Where previously mail workers had to figure out which post office went with which address, now the zip code provided that information for them. The government promoted the new system with a cartoon character, Mr. ZIP, and a song from a zip-code lovin band called The Swingin Six. You know youve gotta have a zip code on the envelope, a zip code so you wont just have to hope. A zip code morning, noon and night, and everything will be alright. And it worked by 1969, 83% of Americans were using zip codes, a
