Sectional center facility

A sectional center facility (SCF) is a processing and distribution center (P&DC) of the United States Postal Service (USPS) that serves a designated geographical area defined by one or more three-digit ZIP Code prefixes. A sectional center facility routes mail between local post offices, sorting and delivery centers (SDCs), to and from network distribution centers (NDCs), and to and from other sectional center facilities.

Source: Wikipedia — Sectional center facility (CC BY-SA 4.0)