What is the ZIP+4 code and how does it enhance presort accuracy?
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A
A 4-digit mailer ID appended for tracking purposes only
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B
A 4-digit suffix added to the 5-digit ZIP Code that identifies a specific delivery segment, enabling finer sort levels
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C
A code assigned by the mailer to designate mailing priority
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D
An optional routing code used only for parcels over 1 pound