The following sources provide access to official and unofficial copies of the United States Constitution:
- Constitution Annotated (CONAN): Official analysis and interpretation of the United States Constitution based on Supreme Court case law and historical practices which is compiled and maintained by the Librarian of Congress.
- GovInfo.gov: Hosts a pocket edition of the United States Constitution and Declaration of Independence, as well as archival PDFs of the Constitution Annotated (CONAN) since 1992.
- United States Code Service (USCS) (Lexis): An unofficial publication which contains the United States Constitution as well as the U.S. Code.
- United States Code Annotated (USCA) (West): An unofficial publication which contains the United States Constitution as well as the U.S. Code.
- LexisNexis Digital Library (Lexis): The United States Constitution in eBook format.