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| Tip Sep 2010 |
| A small plastic freezer bag is the ideal size for toiletries when going through airport security. |
Travel Home > Directory > Travel Dictionary > Z > ZIP Code
ZIP Code - The system of postal codes used by the United States Postal Service (USPS). The letters ZIP, an acronym for Zone Improvement Plan, are written properly in capital letters and were chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use it.
The ZIP code is the system of postal codes used by the United States Postal Service (USPS). The letters ZIP, an acronym for Zone Improvement Plan, are written properly in capital letters and were chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use it. The basic format consists of five numerical digits. An extended ZIP + 4 code includes the five digits of the ZIP code, a hyphen and then four more digits, which allow a piece of mail to be directed to a more precise location than by the ZIP code alone.
