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Numbers
Glossary "Z"
ZIP Code A system of 5-digit codes that identifies the individual post office or metropolitan area delivery station associated with an address. ZIP+4 is an enhanced code consisting of the 5-digit ZIP Code and four additional digits that identify a specific range of delivery addresses.
ZIP+4 barcode A nine-digit POSTNET barcode consisting of 52 vertical bars. Also see Postal Numeric Encoding Technique.
ZIP+4 code A nine-digit numeric code composed of two parts: (a) the initial code: the first five digits that identify the sectional center facility and delivery area associated with the address, followed by a hyphen; and (b) the fourdigit expanded code: the first two additional digits designate the sector (a geographic area) and the last two digits designate the segment (a building, floor, etc.)
Zoned rate —A rate structure for Priority Mail, Periodicals, Parcel Post, and Bound Printed Matter that is based on weight and distance traveled (or number of zones crossed).