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The Library of Congress (LOC) is a research library in Washington, D.C., that serves as the library and research service of the U.S. Congress and the de facto national library of the United States. Founded in 1800, the library is the United States's oldest federal cultural institution.

Visiting the Library. We’re excited to welcome you to the Library of Congress. Free timed-entry passes are required to enter the Library’s Thomas Jefferson Building. We encourage you to take a moment to review our Know Before You Go page to prepare for a safe and enjoyable visit. Visitor Hours. Monday: closed; Tuesday: 10:00 a.m. - 5:00 p.m.

Discover the Library of Congress. Search millions of items in many formats and languages. Explore a growing treasury of digitized materials. Consult with staff online or in one of the research centers to find what you're looking for.

The Library of Congress is the largest library in the world, with millions of books, films and video, audio recordings, photographs, newspapers, maps and manuscriptsin its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office.

The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of Congress. It is also the largest library in the world, with more than 162 million items. The collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.