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A '''ZIP code''' is a five-[[digit]] [[number|numeric]] [[code]] used by the [[United States Postal Service]] in sorting [[mail]]. The first digit indicates a group of [[state]]s; the second and third, a region of a state or a large [[city]]; and the fourth and fifth, a small [[town]], a delivery area in a larger town or city, a particular postal facility, or a particular large mail recipient. Extensions of the ZIP code include the nine-digit ZIP+4 code and the 11-digit ABC (Advanced Bar Coding) code.
[[Category:United States Government]]
[[Category:United States Government]]