- National Archives and Records Administration14,466,347
- Smithsonian Institution3,610,489
- HathiTrust2,912,330
- The New York Public Library2,048,825
- The Portal to Texas History1,379,325
- California Digital Library1,306,638
- University of Southern California Libraries1,210,860
- Mountain West Digital Library817,689
- Digital Commonwealth762,531
- Digital Library of Georgia691,450
- Minnesota Digital Library669,964
- Internet Archive613,172
- Recollection Wisconsin547,650
- Michigan Service Hub493,965
- North Carolina Digital Heritage Center476,531
- Empire State Digital Network403,238
- PA Digital400,100
- Indiana Memory369,664
- Illinois Digital Heritage Hub320,575
- Plains to Peaks Collective309,866
- Big Sky Country Digital Network252,796
- Biodiversity Heritage Library233,948
- Sunshine State Digital Network233,821
- Missouri Hub227,799
- South Carolina Digital Library217,413
- Ohio Digital Network207,227
- United States Government Publishing Office (GPO)199,042
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- OKHub124,944
- Digital Library of Tennessee124,697
- Digital Maryland102,485
- J. Paul Getty Trust99,585
- David Rumsey92,905
- Connecticut Digital Archive89,339
- Harvard Library65,739
- Vermont Green Mountain Digital Archive64,513
- Digital Maine63,492
- Digital Virginias58,486
- District Digital57,753
- Library of Congress4,481