The United States Postal Service (USPS) administers one of the most complex and high-volume delivery networks in the world, processing billions of mail pieces annually. Established in 1963, the Zone Improvement Plan (ZIP) utilizes a hierarchical numeric system to streamline routing across 50 states and various territories. This system is foundational to American logistics, e-commerce, and geographic data analysis.
The ZIP Code is a five-digit numeric code. The first digit represents a group of states, the second and third digits represent a central post office facility (SCF), and the last two digits represent a small post office or local delivery area. The optional +4 extension identifies a specific delivery segment.
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