Decoding the ZIP Code - U.S. Postal Facts
https://facts.usps.com/decoding-the-zip-code/
WebMar 20, 2023 · The first number in the five-digit ZIP Code represents a general geographic area of the nation, “0” in the east, moving to “9” in the west. The next two numbers represent regional areas, and the final two identify specific Post Offices. Decoding the code. In 1983, the ZIP+4 Code was introduced.
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