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3). Understanding the Zipcodes Used in the US By : Warren Wong
The US Postal Service uses zipcodes as part of the addresses so that it can direct the mail to the appropriate person. The ZIP part of the word is an acronym for Zone Improvement Plan. The basic format of all zip codes consists of five numbers, In 1983 a ZIP + 4 format was introduced, which consists of the basic five numbers, a hyphen and then four more numbers.
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