U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 28, 2025

All TitlesTitle 1Chapter IPart 21Subpart A - Subpart A—General

CODE STRUCTURE
§ 21.7 - Titles and subtitles.
§ 21.8 - Chapters and subchapters.
§ 21.9 - Parts, subparts, and undesignated center heads.
§ 21.10 - Sections.
§ 21.1 - Drafting.
§ 21.6 - Notice of expiration of codified material.

NUMBERING
§ 21.11 - Standard organization of the Code of Federal Regulations.
§ 21.12 - Reservation of numbers.
§ 21.14 - Deviations from standard organization of the Code of Federal Regulations.

HEADINGS
§ 21.16 - Required document headings.
§ 21.18 - Tables of contents.
§ 21.19 - Composition of part headings.

AMENDMENTS
§ 21.20 - General requirements.

REFERENCES
§ 21.21 - General requirements: References.
§ 21.23 - Parallel citations of Code and Federal Register.
§ 21.24 - References to 1938 edition of Code.

EFFECTIVE DATE STATEMENT
§ 21.30 - General.

OMB CONTROL NUMBERS
§ 21.35 - OMB control numbers.
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