To ensure mail arrives quickly and is not returned to sender, the USPS Official Website recommends:
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
Pinpoint specific post offices or delivery zones within that region. To ensure mail arrives quickly and is not
Represents a broad geographic area of the country (e.g., "0" for the Northeast, "9" for the West Coast). an office building