USPS & International Address Verification - Smarty
https://www.smarty.com/articles/zip-4-code
Full 9-Digit Zip Code LookupWhat Are Zip+4 Codes?Full 9 Digit Zip Code BenefitsHow Zip Codes Became 9-Digit-Zip CodesZip+4 Code DatabaseWhat Is My Zip Code with The Extra 4 digits?ZIP+4 Codes are 4-digit codes appended to the original 5-digit USPS ZIP Codes. Using the full ZIP Code with the extra 4 digits when mailing via the USPS ensures the fastest, most accurate mailing possible. ZIP plus 4 lookup tools don't just do a full ZIP Code lookup. Before you get the +4 Code, your address is taken through the full address standar...See more on smarty.comHere's what others are reading ZIP+4 Codes are 4-digit codes appended to the original 5-digit USPS ZIP Codes. Using the full ZIP Code with the extra 4 digits when mailing via the USPS ensures the fastest, most accurate mailing possible. ZIP plus 4 lookup tools don't just do a full ZIP Code lookup. Before you get the +4 Code, your address is taken through the full address standar...
ZIP+4 Codes are 4-digit codes appended to the original 5-digit USPS ZIP Codes. Using the full ZIP Code with the extra 4 digits when mailing via the USPS ensures the fastest, most accurate mailing possible. ZIP plus 4 lookup tools don't just do a full ZIP Code lookup. Before you get the +4 Code, your address is taken through the full address standar...
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