Usps.zip

Introduced on , the ZIP ( Zone Improvement Plan ) code was designed to modernize mail delivery by enabling automated sorting. Before its adoption, mail passed through 17 sorting steps; the code reduced this significantly by providing a geographic "map" within a few digits. The 5-Digit Core:

Use all capital letters and avoid punctuation like periods or commas.

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

To ensure mail arrives quickly and is not returned to sender, the USPS Official Website recommends:

Indicate regional areas or a Sectional Center Facility (SCF) , which acts as a central sorting hub. Introduced on , the ZIP ( Zone Improvement

Use the USPS ZIP Code Lookup tool to verify the correct 5-digit or ZIP+4 code for any address.

Pinpoint specific post offices or delivery zones within that region. Launched in 1983 , this adds a hyphen

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