---
kind: "unit"
title: "39"
title_heading: "Postal Service"
key: "ptIV/ch36/schI"
level: "subchapter"
label: "Subchapter I"
heading: "Provisions Relating to Market-Dominant Products"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/39/ptIV-ch36-schI"
sections_count: 7
---

# Subchapter I — Provisions Relating to Market-Dominant Products

Title 39 — Postal Service › Part IV — Mail Matter › Chapter 36 — Postal Rates, Classes, and Services

## Sections

- [§3621. Applicability; definitions](/usc/39/3621.md)
- [§3622. Modern rate regulation](/usc/39/3622.md)
- [§3623...3625. Repealed.](/usc/39/3623...3625.md)
- [§3626. Reduced rates](/usc/39/3626.md)
- [§3627. Adjusting free rates](/usc/39/3627.md)
- [§3628. Repealed.](/usc/39/3628.md)
- [§3629. Reduced rates for voter registration purposes](/usc/39/3629.md)