The phrase is likely a play on words referring to the ZIP+4 Code , also known as a 9-digit ZIP Code . Using a "full" ZIP code ensures your mail travels as efficiently—or "to the fullest"—as possible through the U.S. Postal Service . What is a "Full" ZIP Code?
A standard ZIP code has five digits, but the adds a hyphen and four extra numbers:
: Identify a specific delivery area or post office.
The phrase is likely a play on words referring to the ZIP+4 Code , also known as a 9-digit ZIP Code . Using a "full" ZIP code ensures your mail travels as efficiently—or "to the fullest"—as possible through the U.S. Postal Service . What is a "Full" ZIP Code?
A standard ZIP code has five digits, but the adds a hyphen and four extra numbers:
: Identify a specific delivery area or post office.