Part IV. MAIL MATTER

• CHAPTER 30 [§ 3001 - § 3018] - NONMAILABLE MATTER
• CHAPTER 32 [§ 3201 - § 3220] - PENALTY AND FRANKED MAIL
• CHAPTER 34 [§ 3401 - § 3406] - ARMED FORCES AND FREE POSTAGE
• CHAPTER 36 [§ 3621 - § 3692] - POSTAL RATES, CLASSES, AND SERVICES
• CHAPTER 37 [§ 3701 - § 3705] - NONPOSTAL SERVICES