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
Use all capital letters and avoid punctuation like periods or commas. USPS.zip
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 Launched in 1983 , this adds a hyphen
Pinpoint specific post offices or delivery zones within that region. How to Send a Letter or Postcard: Domestic
Indicate regional areas or a Sectional Center Facility (SCF) , which acts as a central sorting hub.
In the context of data management, frequently appears as a filename for address databases or postal datasets . Developers and researchers often download compressed .zip files containing the USPS City State Product or the ZIP+4 Product to ensure their shipping software or marketing databases use current, accurate delivery data. Best Practices for Mailing
Represents a broad geographic area of the country (e.g., "0" for the Northeast, "9" for the West Coast).