Largest library
US Library of Congress
173,731,463 total number
United States (Washington, DC)

The world’s largest library, measured by catalogue size (number of items), is the US Library of Congress, which is based in Washington DC and was home to 173,731,463 items as of November 2021. Spread across approximately 838 miles of bookshelves, the collection includes 41 million books and other print materials, 4.1 million recordings, 15 million photographs, 5.6 million maps and 75 million manuscripts.

The library adds approximately 12,000 items to its collections daily, the majority of which are received through the Copyright registration process.