Chapter I — United States Postal Service
- Subch. A The Board of Governors of the U.s. Postal Service §§1.1 to 11.1
- Subch. B International Mail §§20.1 to 20.5
- Subch. C Post Office Services [domestic Mail] §§111.1 to 122.2
- Subch. D Organization and Administration §§211.1 to 281.4
- Subch. E Restrictions on Private Carriage of Letters §§310.1 to 320.9
- Subch. F Personnel §§447.11 to 492.1
- Subch. G Postage Programs §§501.1 to 551.8
- Subch. H Procurement System for the U.s. Postal Service: Intellectual Property Rights Other Than Patents §§601.100 to 602.3
- Subch. I Subchapter I [reserved]
- Subch. J Postal Service Debt Obligations; Disbursement Postal Money Orders §§760.1 to 762.45
- Subch. K Environmental Regulations §§775.1 to 776.10
- Subch. L Special Regulations §§777.11 to 778.13
- Subch. M Subchapter M [reserved]
- Subch. N Procedures §§912.1 to 966.13