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Regulations last checked for updates: Jul 31, 2025
Title 39 - Postal Service last revised: Jul 17, 2025
All Titles
Title 39
Chapter I
Part 121 - PART 121—SERVICE STANDARDS FOR MARKET-DOMINANT MAIL PRODUCTS
§ 121.0 - Market-dominant product service standards.
§ 121.1 - First-Class Mail.
§ 121.2 - Periodicals.
§ 121.3 - USPS Marketing Mail.
§ 121.4 - Package Services.
Appendix Appendix A - Appendix A to Part 121—Tables Depicting Service Standard Day Ranges
authority:
39 U.S.C. 101
,
401
,
403
,
404
,
1001
,
3691
source:
90 FR 10869, Feb. 28, 2025, unless otherwise noted.
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