ZIP Codes (TM)
- 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."
- Date of creation: 16-Mar-2026
Accepted term: 16-Mar-2026