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ZIP codes in US are a system of postal codes used by the United States Postal Service since 1963. The ZIP code term (Zone Improvement Plan) was chosen to suggest that the postal mail travels more efficiently and quickly, when senders use the code in the postal address. The basic format of US ZIP code consists five decimal numerical digits.

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ZIP codes by US state:

AK AL AR AZ CA CO CT DC DE FL GA HI IA ID IL IN KS KY LA MA MD ME MI MN MO MS MT NC ND NE NH NJ NM NV NY OH OK OR PA RI SC SD TN TX UT VA VT WA WI WV WY

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