U.S.C. vs. U.S.C.A.: What's the Difference?

Three things: who publishes it, whether it is official, and what surrounds the statutory text.

The U.S.C. is compiled by the Office of the Law Revision Counsel of the U.S. House of Representatives and published by the Government Publishing Office. A new bound edition comes out every six years, with annual cumulative supplements in between. The OLRC also maintains a continuously updated version at uscode.house.gov. What you get is the operative language of the section, a source credit showing which public laws created and amended it, and editorial notes (amendment notes, effective dates, transfer notes). You do not get case citations.

U.S.C.A. is West's (Thomson Reuters) version. The statutory text is the same text the OLRC codified, but each section is followed by an apparatus: Historical and Statutory Notes, cross-references to C.F.R. and West's key number system, references to treatises and law review articles, and above all 'Notes of Decisions' — headnote-style summaries of every case that has construed the section, organized by topic and numbered. For a heavily litigated provision like 42 U.S.C.A. § 1983, the Notes of Decisions run to multiple volumes. That editorial apparatus is not law and is not citable authority.

U.S.C.S. — the United States Code Service, published by LexisNexis — is the third member of the family. It plays the same role as U.S.C.A. on the other research platform.

Cite U.S.C. The Bluebook's rule for statutes (Rule 12.2.1) directs you to the current official code whenever the provision is contained in it, and Table T1.1 lists U.S.C. as the official federal code with U.S.C.A. and U.S.C.S. as the unofficial alternatives. The ALWD Guide takes the same position.

The forms differ in one visible way: unofficial codes require a publisher in the parenthetical.

The date in an annotated-code parenthetical is the year of the volume and pocket part or supplement you actually consulted, not the year the statute was enacted. Note also that the date parenthetical requirements for the current official code have changed across Bluebook editions — check Rule 12.3.2 in the edition your school or journal uses, and follow your journal's house style if you are on a staff.

When the official code does not yet contain what you need. Congress amends statutes continuously; the print U.S.C. is published on a six-year cycle. If a statute was amended last month, the amendment may appear in U.S.C.A. and U.S.C.S. before it appears in the official code you can verify. In that situation you have two acceptable options: cite the session law (e.g., Pub. L. No. 117-103, 136 Stat. 49) or cite the unofficial code with its publisher parenthetical.

Also cite the annotated version when you are quoting or relying on something that only exists there. That is rare and usually a mistake. Editorial notes and Notes of Decisions are West's or Lexis's work product; they are not authority, and citing 'Notes of Decisions' in a brief signals that you did not read the underlying case. Read the case, then cite the case.

One more scenario: some appellate courts and agencies have local rules or style manuals specifying a citation format. Check them before you file anything.

Yes, and this is the one place where the distinction has substantive bite. Under 1 U.S.C. § 204(a), titles of the U.S.C. that Congress has enacted into positive law are themselves legal evidence of the law. Titles that have not been enacted into positive law are only prima facie evidence — the codified text is a presumptively accurate restatement, but the Statutes at Large is the legal evidence of what Congress passed. See 1 U.S.C. § 112.

Roughly half the titles are positive law, including Title 11 (Bankruptcy), Title 17 (Copyrights), Title 18 (Crimes), Title 26 (Internal Revenue Code), Title 28 (Judiciary), and Title 35 (Patents). Many workhorse titles are not, including Title 15 (Commerce and Trade), Title 29 (Labor), and Title 42 (Public Health and Welfare). The OLRC site flags the status of every title.

So if you are litigating a comma in a non-positive-law title, go behind the code to the session law. Historically, U.S.C.S. has been described as following the Statutes at Large text more closely, while U.S.C.A. tracks the OLRC's codified text; where accuracy of a word matters, do not rely on either editor. Pull the public law from the Statutes at Large on govinfo.gov and cite it: e.g., Civil Rights Act of 1964, Pub. L. No. 88-352, 78 Stat. 241.

When you search 'USCA' on Westlaw you are in U.S.C.A. When you search the code on Lexis you are in U.S.C.S. Both platforms also carry an unannotated version of the official code, but the annotated database is the default, which is why students routinely paste 'U.S.C.A.' into a memo without noticing. If your citation says U.S.C.A. and you never used an annotation, convert it to U.S.C. and confirm the section against uscode.house.gov or govinfo.gov.

The practical difference between the two annotated services is coverage philosophy. U.S.C.A.'s Notes of Decisions aim to be exhaustive and integrate with West key numbers, so the same headnote taxonomy carries you into the digests. U.S.C.S.'s case notes have traditionally been more selective and more likely to include administrative decisions and agency materials. Neither is 'better'; use whichever platform your school licenses, and understand that a section's annotations are a curated finding aid, not a complete list of every case citing the statute.

Always finish by running the citator — KeyCite on Westlaw, Shepard's on Lexis — on the statute itself. That is how you catch repeal, amendment, and constitutional challenges, and it is a step the print pocket part cannot do for you.

In print, U.S.C.A. and U.S.C.S. update through annual pocket parts inserted in the back of each bound volume, plus interim supplementary pamphlets and advance legislative service pamphlets. The bound-volume-plus-pocket-part method is why the citation parenthetical for an unofficial code can carry two dates when the volume and pocket part years differ. The official U.S.C. updates through annual cumulative supplements between six-year editions.

Online, the OLRC site states its currency ('current through Public Law X') at the top of each page. Screenshot or note that currency line when you rely on it, and check whether any pending amendments are flagged in the section's notes. If your section shows an effective date in the future, say so explicitly in your memo — a statute on the books but not yet operative is a classic trap in an assignment.

In a legal writing course, the most common deductions are: citing U.S.C.A. when U.S.C. was available; omitting the publisher from an unofficial code parenthetical; putting the year of enactment rather than the year of the code edition in the parenthetical; and citing a Note of Decisions instead of the case it summarizes.

Two smaller ones. First, section symbols: use one § for a single section and §§ for multiple (42 U.S.C. §§ 1981-1983). Second, subsections attach directly to the section number without spaces — 18 U.S.C. § 1962(c), not § 1962 (c). And when you cite an act by name, give the popular name plus the code cite, e.g., Americans with Disabilities Act of 1990, 42 U.S.C. §§ 12101-12213.