In June 1962, after a study of mechanization, the presidentially appointed Advisory Board of the Post Office Department made several recommendations.
Yet while mail volume grew and while the Post Office Department had been at the forefront of advances in transportation, the methods and much of the equipment used to sort mail in thousands of Post Offices remained the same as in Benjamin Franklin’s day. The development of the computer brought centralization of accounts and sent a growing mass of utility bills and payments, bank deposits and receipts, advertising, magazines, credit card transactions, mortgage bills and payments, and Social Security checks through the mail. By 1963, 80 percent of all mail in the United States was business mail.
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The social correspondence of the 19th century had given way, gradually then explosively, to business mail. Twenty years later, the Department implemented an even farther reaching plan, the Zoning Improvement Plan (ZIP) Code. Under this system, delivery units or zones were identified by one or two numbers between the city and state - for example, Birmingham 7, Alabama - so that mail could be separated by employees who did not have detailed scheme knowledge. To offset the loss, in May 1943 the Post Office Department began a zoning address system in 124 of the largest cities.
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Look Up a ZIP Code by address, by city or by state from the official source, the United States Postal Service:Ĭlick to Lookup Zip Code By City and StateĬlick to How To Read A ZIP Code History of the ZIP Codeĭuring World War II, thousands of experienced postal employees left to serve with the military.
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