CFR›Title 39 ContainsChapter I; Chapter IIICorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 Chapters I Chapter I—United States Postal Service Parts 1–999 III Chapter III—Postal Regulatory Commission Parts 3000–3099 Previous 38 Title 38—Pensions, Bonuses, and Veterans' Relief Next 40 Title 40—Protection of Environment