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US City Zip Code

US City Zip Code

Submitted by • July 11, 2013

Zip codes are used by the US Postal Service to make mail delivery more efficient. The basic format of US zip codes consists of five numbers. The first three numbers represent the sectional center facility and the other digits represent the older postal code for a specific state or city. The process of using postal coded for US cities came into effect in 1943, but in 1963, zip codes came into use for the whole country.

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Voted by desonmarooin

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