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From Wikipedia, the free encyclopedia - The Library of Congress is the largest library in the United States. Above, the Library of Congress' Thomas Jefferson Building. The American Library Association maintains a list of the 100 largest libraries in the United States by volumes held. The ALA's list was last updated in October 2012, although much of the most recent data is from 2009-2010 report by the Association of Research Libraries (academic institutions) and the 2011 Statistical Report of the Public Library Data Service

1. Library of Congress: The Library of Congress is the research library of the United States Congress, the de facto national library of the United States of America, and the oldest federal cultural institution in the United States. Located in four buildings in Washington, D.C., as well as the Packard Campus[2] in Culpeper, Virginia, it is one of the two largest libraries in the world by shelf space and number of books, the other being The British Library.[3] The head of the Library is the Librarian of Congress, currently James H. Billington.