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Publication 5594: Standard Postal Service State Abbreviations and ZIP Codes
- Product number
- Publication 5594
- Title
- Standard Postal Service State Abbreviations and ZIP Codes
- Type
- Publications
- Issuing body
- Internal Revenue Service (irs.gov)
- Revision (per IRS index)
- Dec 2021
The number, title, and revision date above are reproduced verbatim from the
official IRS
index (captured July 2026). Newer revisions may exist — check irs.gov. This page adds
no instructions or commentary. Not tax or legal advice.