- National Archives and Records Administration17,749,100
- Smithsonian Institution7,425,484
- HathiTrust3,033,985
- California Digital Library2,090,542
- The Portal to Texas History1,897,491
- Mountain West Digital Library1,218,151
- Michigan Service Hub1,130,879
- Digital Commonwealth1,001,934
- Digital Library of Georgia947,076
- Minnesota Digital Library911,757
- Plains to Peaks Collective858,865
- The New York Public Library802,466
- Internet Archive693,665
- PA Digital683,816
- OKHub682,207
- North Carolina Digital Heritage Center679,910
- Recollection Wisconsin675,963
- Missouri Hub608,461
- Illinois Digital Heritage Hub533,598
- Indiana Memory463,522
- Empire State Digital Network443,200
- Ohio Digital Network384,217
- NJ/DE Digital Collective315,691
- United States Government Publishing Office (GPO)288,861
- Biodiversity Heritage Library279,893
- Sunshine State Digital Network276,958
- South Carolina Digital Library276,164
- Northwest Digital Heritage257,023
- Digital Library of Tennessee157,790
- University of Washington141,840
- Kentucky Digital Library141,608
- Digital Maryland124,869
- David Rumsey121,396
- Connecticut Digital Archive120,909
- Artstor108,681
- J. Paul Getty Trust99,618
- Vermont Green Mountain Digital Archive97,748
- Harvard Library92,066
- Digital Virginias91,299
- Texas Digital Library87,833
- Digital Maine63,492
- Orbis Cascade Alliance61,404
- Big Sky Country Digital Network59,573
- District Digital57,753
- Community Webs4,901
- Library of Congress4,463