![]() ![]() “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.” “During World War II, thousands of experienced postal employees left to serve with the military. The US Post Office says the following about its zip code system: Businesses can get a discount if they use the 9-digit code. With nine digits, it can carry out a more detailed identification.Įven though the 5-digit zip code is still enough for sending postal items, the 9-digit code is used mainly for businesses. It subsequently expanded it to nine digits. ![]() Originally, the US Post Office used a 5-digit zip code. The zip code is a system the United States Postal Service uses to identify a location and route the mail to that specific location. ![]()
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