If you have access to the United States Code (U.S.C.) or one of its annotated versions (U.S.C.A. or U.S.C.S.) in print, you can find federal statutes by:
(1) citation;
(2) popular name;
(3) browsing the table of contents; and
(4) subject.
The U.S. House of Representatives' Office of the Law Revision Counsel maintains an up-to-date and searchable online version of the United States Code that allows you to retrieve a federal statute by citation, browse by title and section, locate an Act by popular name, or search the text of the United States Code.
The Government Publishing Office (GPO) maintains an authenticated online version of the United States Code through its govinfo website that you can browse by title and section, retrieve by citation, or keyword search.
Non-governmental websites such as Cornell Law School's Legal Information Institute offer unofficial unannotated versions of the United States Code that allow you to browse, search, or retrieve federal statutes by citation or popular name.
Federal agency websites can be a great resource for finding links to key federal laws they implement and enforce.
For example, the U.S. Department of Education maintains a website devoted to the Individuals with Disabilities Education Act (amended by the IDEIA in 2004). The IDEA website includes a Law and Policy tab, which provides a link to the text of the law.
You can find an A-Z Index of of U.S. government department and agency websites on the usa.gov website where you can also search for agencies by topic.
Some public libraries and colleges and universities provide access to annotated versions of the United States Code through subscriptions to Westlaw (U.S.C.A.) or LexisNexis (U.S.C.S.).
For example, the Richland Library and the Greenville County library systems offer public access Westlaw (U.S.C.A.) to its members and the University of South Carolina subscribes to NexisUni™, formerly LexisNexis Academic (U.S.C.S.).
Both subscription databases allow you to retrieve a federal statute by citation, browse by title and section, locate an Act by popular name, and search the text of their annotated United States Codes.