The United States Code is the codification by subject matter of the general and permanent laws of the United States based on what is printed in the Statutes at Large. It is divided by broad subjects into 50 titles and published by the Office of the Law Revision Counsel of the U.S. House of Representatives.

Since 1926, the United States Code has been published every six years. In between editions, annual cumulative supplements are published in order to present the most current information. Documents are available only as ASCII text files.

GPO Access contains the 2000 and 1994 editions of the U.S. Code, plus annual supplements. At this time, the Statutes at Large is not available on GPO Access.

When a section is affected by a law passed after a supplement's revision date, the header for that section includes a note that identifies the public law affecting it. In order to find the updated information, you must search the public laws databases for the referenced public law number.

The U.S. Code on GPO Access is the official version of the Code, however, two unofficial editions are available. These are the U.S.C.A.(U.S. Code Annotated) and the U.S.C.S. (U.S. Code Service). The U.S.C.A. and U.S.C.S. contain everything that is printed in the official U.S. Code but also include annotations to case law relevant to the particular statute. While these unofficial versions may be more current, they are not official and not available from the U.S. Government Printing Office.

NOTE: Of the 50 titles, only 23 have been enacted into positive (statutory) law. These titles are 1, 3, 4, 5, 9, 10, 11, 13, 14, 17, 18, 23, 28, 31, 32, 35, 36, 37, 38, 39, 44, 46, and 49. When a title of the Code was enacted into positive law, the text of the title became legal evidence of the law. Titles that have not been enacted into positive law are only prima facie evidence of the law. In that case, the Statutes at Large still govern.

The U.S. Code does not include regulations issued by executive branch agencies, decisions of the Federal courts, treaties, or laws enacted by State or local governments. Regulations issued by executive branch agencies are available in the Code of Federal Regulations. Proposed and recently adopted regulations may be found in the Federal Register.

http://uscode.house.gov/codification/legislation.php

Codification Legislation

Office of the Law Revision Counsel

What Is Positive Law Codification?

Positive law codification is the process of preparing and enacting, one title at a time, a revision and restatement of the general and permanent laws of the United States.

Because many of the general and permanent laws that are required to be incorporated into the United States Code are inconsistent, redundant, and obsolete, the Office of the Law Revision Counsel of the House of Representatives has been engaged in a continuing comprehensive project authorized by law to revise and codify, for enactment into positive law, each title of the Code. When this project is completed, all the titles of the Code will be legal evidence of the general and permanent laws and recourse to the numerous volumes of the United States Statutes at Large for this purpose will no longer be necessary.

Positive law codification bills prepared by the Office do not change the meaning or legal effect of a statute being revised and restated. Rather, the purpose is to remove ambiguities, contradictions, and other imperfections from the law.

http://thomas.loc.gov/home/lawsmade.bysec/publication.html

How Our Laws Are Made

XIX. PUBLICATION

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Slip Laws - Statutes-at-Large - United States Code

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One of the important steps in the enactment of a valid law is the requirement that it shall be made known to the people who are to be bound by it. There would be no justice if the state were to hold its people responsible for their conduct before it made known to them the unlawfulness of such behavior. In practice, our laws are published immediately upon their enactment so that the public will be aware of them.

If the President approves a bill, or allows it to become law without signing it, the original enrolled bill is sent from the White House to the Archivist of the United States for publication. If a bill is passed by both Houses over the objections of the President, the body that last overrides the veto transmits it. It is then assigned a public law number, and paginated for the Statutes at Large volume covering that session of Congress. The public and private law numbers run in sequence starting anew at the beginning of each Congress and are prefixed for ready identification by the number of the Congress. For example, the first public law of the 108th Congress is designated Public Law 108-1 and the first private law of the 108th Congress is designated Private Law 108-1. Subsequent laws of this Congress also will contain the same prefix designator.

Slip Laws
The first official publication of the statute is in the form generally known as the "slip law". In this form, each law is published separately as an unbound pamphlet. The heading indicates the public or private law number, the date of approval, and the bill number. The heading of a slip law for a public law also indicates the United States Statutes at Large citation. If the statute has been passed over the veto of the President, or has become law without the President's signature because he did not return it with objections, an appropriate statement is inserted instead of the usual notation of approval.

The Office of the Federal Register, National Archives and Records
Administration prepares the slip laws and provides marginal editorial notes giving the citations to laws mentioned in the text and other explanatory details. The marginal notes also give the United States Code classifications, enabling the reader immediately to determine where the statute will appear in the Code. Each slip law also includes an informative guide to the legislative history of the law consisting of the committee report number, the name of the committee in each House, as well as the date of consideration and passage in each House, with a reference to the Congressional Record by volume, year, and date. A reference to presidential statements relating to the approval of a bill or the veto of a bill when the veto was overridden and the bill becomes law is included in the legislative history as a citation to the Weekly Compilation of Presidential Documents.

Copies of the slip laws are delivered to the document rooms of both Houses where they are available to officials and the public. They may also be obtained by annual subscription or individual purchase from the Government Printing Office and are available in electronic form. Section 113 of title 1 of the United States Code provides that slip laws are competent evidence in all the federal and state courts, tribunals, and public offices. Statutes at Large
The United States Statutes at Large, prepared by the Office of the Federal Register, National Archives and Records Administration, provide a permanent collection of the laws of each session of Congress in bound volumes. The latest volume containing the laws of the first session of the 107th Congress is number 115 in the series. Each volume contains a complete index and a table of contents. A legislative history appears at the end of each law. There are also extensive marginal notes referring to laws in earlier volumes and to earlier and later matters in the same volume.

Under the provisions of a statute originally enacted in 1895, these volumes are legal evidence of the laws contained in them and will be accepted as proof of those laws in any court in the United States.

The Statutes at Large are a chronological arrangement of the laws exactly as they have been enacted. The laws are not arranged according to subject matter and do not reflect the present status of an earlier law that has been amended. The laws are organized in that manner in the code of laws.

United States Code
The United States Code contains a consolidation and codification of the general and permanent laws of the United States arranged according to subject matter under 50 title headings, largely in alphabetical order. It sets out the current status of the laws, as amended, without repeating all the language of the amendatory acts except where necessary. The Code is declared to be prima facie evidence of those laws. Its purpose is to present the laws in a concise and usable form without requiring recourse to the many volumes of the Statutes at Large containing the individual amendments.

The Code is prepared by the Law Revision Counsel of the House of Representatives. New editions are published every six years and cumulative supplements are published after the conclusion of each regular session of the Congress. The Code is also available in electronic format on CD-ROM and the Internet.

Twenty-four of the 50 titles have been revised and enacted into positive law, and one title has been eliminated by consolidation with another title. Titles that have been revised and enacted into positive law are legal evidence of the law and may be updated by direct amendment. Eventually all the titles will be revised and enacted into positive law.