ZIP+4

The 9-digit numeric code, established in 1981, composed of two parts: (a) The initial code: the first 5 digits identify the sectional center facility and delivery area associated with the address, followed by a hyphen; and (b) the 4-digit expanded code: the first two additional digits designate the sector and the last two digits designate the segment. ZIP+4 is a USPS trademark.

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