---
kind: "unit"
title: "39"
title_heading: "Postal Service"
key: "chI/subchC"
level: "subchap"
label: "Subchapter C"
heading: "Post Office Services [domestic Mail]"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/39/chI-subchC"
sections_count: 11
---

# Subchapter C — Post Office Services [domestic Mail]

Title 39 C.F.R. — Postal Service › Chapter I — United States Postal Service

## Contents

- [Part 111 — General Information on Postal Service](/cfr/39/chI-subchC-part111.md)
- [Part 121 — Service Standards for Market-Dominant Mail Products](/cfr/39/chI-subchC-part121.md)
- [Part 122 — Service Standards for Market-Dominant Special Services Products](/cfr/39/chI-subchC-part122.md)