Use the USPS ZIP Code Lookup tool to verify the correct 5-digit or ZIP+4 code for any address.
Represents a broad geographic area of the country (e.g., "0" for the Northeast, "9" for the West Coast). 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 Use the USPS ZIP Code Lookup tool to
Pinpoint specific post offices or delivery zones within that region. "0" for the Northeast
Indicate regional areas or a Sectional Center Facility (SCF) , which acts as a central sorting hub.