Represents a broad geographic area of the country (e.g., "0" for the Northeast, "9" for the West Coast).
The ZIP code should always follow the state abbreviation on the last line of the address block. How to Send a Letter or Postcard: Domestic - USPS USPS.zip
Launched in 1983 , this adds a hyphen and four extra digits to identify even smaller units like a specific city block, an office building, or even a single floor within a skyscraper. Digital "USPS.zip" Files Represents a broad geographic area of the country (e