ZIPcodes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing more specific areas, such as small towns or regions of that city.
For example, ZIPCodes beginning with 0 and 1 are in use in New York; beginning with 2 and 5, in the District of Columbia; and beginning with 7 and 8, in Texas.
For example, ZIPcode 03750 is for Etna, New Hampshire, but Etna is not a city or town; it is actually a village district in the town of Hanover, which itself is assigned the ZIPcode 03755.
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