Carrier Route Code - The alphanumeric code provided on a mailing label to identify a given carrier route. The geographical designation for these codes is updated every six months by the USPS which furnishes a CRIS tape (carrier route information system) to be used for carrier-route coding and sorting.

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Source: Postcom, 15 February 2010 11:42:05, http://postcom.org/public/admail_image/glossary.htm