Title 39 › PART IV — MAIL MATTER › CHAPTER 36 — POSTAL RATES, CLASSES, AND SERVICES › SUBCHAPTER I — PROVISIONS RELATING TO MARKET-DOMINANT PRODUCTS › § 3621
Applies to ten types of mail, including first‑class, periodicals, standard mail, single‑piece parcel post, media mail, bound printed matter, library mail, special services, and single‑piece international mail. The Postal Regulatory Commission may change the list under section 3642. Each term is defined by the mail classification schedule.
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Legislative History
Reference
Citation
39 U.S.C. § 3621
Title 39, Postal Service
Last Updated
Sep 22, 2026
Release point: 119-110