Represents a broad geographic area of the country (e.g., "0" for the Northeast, "9" for the West Coast).
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 USPS.zip
Use all capital letters and avoid punctuation like periods or commas. Represents a broad geographic area of the country (e