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 ?
I look at three levels of geographic concentration: the 3 digit zip code level, the 2 digit zip code level, and the national level.
The second characteristic that is statistically different is the percentage of highway stations in the 3 digit zip code area of a station.
(25.) The Netherlands consists of 90 areas at the 2 digit zip code level (average size 375 [km.sup.2], average number of stations 44) and 829 areas at the 3 digit zip code level (average size 41 [km.sup.2], average number of stations 5).