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Explore the world's largest library with online and in-person services, exhibitions, events and collections. Learn about the history, culture and heritage of the United States and the world.
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- Digital Collections
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.
- 3,105
- 173 million items
- April 24, 1800; 223 years ago
- Washington, D.C.
Know Before You Go. Welcome to the Library of Congress. We’ve added new policies to help keep our community safe. Free timed-entry tickets are required for entry. Groups of 21 people or more must request free timed-entry tickets by completing our group registration form. Masks are optional, but use is encouraged.
Apr 21, 2024 · Library of Congress, the de facto national library of the United States and the largest library in the world. Its collection was growing at a rate of about two million items per year; it reached more than 170 million items in 2020.
- James H. Billington
Research guides to the Library's collections, as well as subject guides prepared by Library of Congress staff, are listed below. More online guides covering other Library of Congress collections are available via the LC Bibliographies, Research Guides and Finding Aids page.
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U.S. Congress legislation, Congressional Record debates, Members of Congress, legislative process educational resources presented by the Library of Congress.