: Pinpoint a specific local post office or delivery station. The Evolution of ZIP+4
The Zoning Improvement Plan (ZIP) was introduced in 1963 to manage the growing volume of mail across the United States. The system is hierarchical: 039983 zip
: The first two digits of the +4 code usually represent a group of streets, several blocks, or a large building. : Pinpoint a specific local post office or delivery station