Sectional Center Facility (SCF) Boundary File
An SCF is a postal facility that serves as the processing and distribution center (P&DC) for post offices in a designated geographic area as defined by the first three digits of the ZIP Codes of those offices.

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ZIP Code® Boundary File
ZIP Codes®, established in 1963, is a system of 5-digit codes that identifies the individual post office or metropolitan area delivery station associated with an address.

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ZIP+4® Point File
ZIP+4®, the nine-digit numeric code, established in 1981, is 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 four-digit 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.).

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Carrier Route Boundary File
A Carrier Route is the addresses to which a carrier delivers mail. In common usage, a carrier route includes city routes, rural routes and highway contract routes.

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