Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Information Forms (hierarchy name)
5. information forms (objects)
6. information artifacts
7. [information artifacts by function]
8. identifying artifacts
9. identification numbers and codes
10. code numbers

Anotations

Scope note:

Five-digit postal codes used by the United States Postal Service (USPS) to identify specific geographic areas. Originally designed to speed mail sorting and routing. ZIP is an acronym for "Zone Improvement Plan." These may also be used for demographic analysis, insurance adjustments, or other purposes of identification. For the 2-letter codes used to identify US states, use "US Postal Service codes."