Three-Digit Zip Code

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Three-Digit Zip Code

A prefix in a zip code representing a general geographic area. An area denoted by a three-digit zip code is serviced by a single postal facility (though a post office may have more than one three-digit code assigned to it).
References in periodicals archive ?
The area defined by the three digit zip code can be immense: One end of the area may have overly strict building codes while another end may be more lenient.