- National Archives and Records Administration13,217,067
- Smithsonian Institution3,769,838
- HathiTrust2,912,330
- The New York Public Library2,048,825
- The Portal to Texas History1,326,891
- California Digital Library1,293,065
- University of Southern California Libraries1,210,860
- Mountain West Digital Library1,086,844
- Digital Commonwealth762,531
- Digital Library of Georgia691,450
- Minnesota Digital Library669,964
- Internet Archive601,783
- Recollection Wisconsin547,650
- North Carolina Digital Heritage Center476,531
- Michigan Service Hub431,397
- Empire State Digital Network403,238
- PA Digital400,100
- Indiana Memory343,296
- Illinois Digital Heritage Hub315,116
- Plains to Peaks Collective309,866
- Biodiversity Heritage Library233,948
- Missouri Hub227,799
- Sunshine State Digital Network226,516
- South Carolina Digital Library217,413
- United States Government Publishing Office (GPO)194,690
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- Digital Library of Tennessee124,896
- OKHub123,682
- Ohio Digital Network107,539
- Digital Maryland102,485
- J. Paul Getty Trust99,569
- David Rumsey92,905
- Connecticut Digital Archive89,339
- Big Sky Country Digital Network78,126
- Harvard Library65,739
- Digital Maine63,492
- Digital Virginias58,486
- District Digital57,753
- Vermont Green Mountain Digital Archive51,452
- Library of Congress4,481