Definition: Usps0005 - A unique number used in U.S. Postal Service for its postal services, which represents a combination of digits that vary in length from 2 to 7 (for "first", "second" or "third"). This number is often seen on all letterboxes, but it is not used by the USPS for traditional mail delivery. Usps0005 is primarily used within the Postal Service and may be printed on its official identification materials.
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