- National Archives and Records Administration16,649,775
- Smithsonian Institution6,023,798
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,996,181
- The Portal to Texas History1,678,269
- Mountain West Digital Library1,094,352
- Michigan Service Hub1,019,946
- Digital Commonwealth925,452
- Digital Library of Georgia812,300
- Minnesota Digital Library804,195
- Internet Archive648,893
- Recollection Wisconsin629,437
- PA Digital618,908
- North Carolina Digital Heritage Center611,590
- Plains to Peaks Collective553,965
- OKHub528,243
- Missouri Hub507,614
- Indiana Memory444,863
- Empire State Digital Network443,200
- Illinois Digital Heritage Hub419,226
- Sunshine State Digital Network304,446
- Ohio Digital Network274,550
- South Carolina Digital Library261,684
- Biodiversity Heritage Library256,691
- United States Government Publishing Office (GPO)234,754
- Digital Library of Tennessee142,043
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- NJ/DE Digital Collective126,452
- Connecticut Digital Archive115,175
- Digital Maryland112,333
- David Rumsey107,929
- Big Sky Country Digital Network100,655
- J. Paul Getty Trust99,618
- Harvard Library92,066
- Northwest Digital Heritage86,342
- Vermont Green Mountain Digital Archive72,266
- Digital Virginias69,507
- Digital Maine63,492
- Orbis Cascade Alliance61,614
- District Digital57,753
- Texas Digital Library10,657
- Library of Congress4,481