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 company's RADARS(R) System can detect signals down to the three digit zip code in specific geographic areas.
As a result of these modifications, WebMD is now providing to Quintiles three digit zip code fields (or in less populous areas, two digit zip code fields) instead of five and nine digit zip code fields, and "month/year" birth date fields instead of "month/day/year" birth date fields.