- National Archives and Records Administration16,487,384
- Smithsonian Institution5,989,408
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,979,518
- The Portal to Texas History1,644,866
- Mountain West Digital Library1,199,162
- Michigan Service Hub1,019,946
- Digital Commonwealth925,452
- Digital Library of Georgia795,885
- Minnesota Digital Library790,689
- Internet Archive643,986
- Recollection Wisconsin629,437
- PA Digital618,908
- North Carolina Digital Heritage Center601,446
- Plains to Peaks Collective553,965
- Missouri Hub492,373
- OKHub487,522
- Empire State Digital Network443,200
- Illinois Digital Heritage Hub419,226
- Indiana Memory382,809
- Sunshine State Digital Network305,874
- Ohio Digital Network274,550
- Biodiversity Heritage Library256,691
- South Carolina Digital Library254,785
- United States Government Publishing Office (GPO)231,557
- Digital Library of Tennessee142,043
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- NJ/DE Digital Collective126,452
- Connecticut Digital Archive115,175
- David Rumsey107,929
- Digital Maryland103,789
- Big Sky Country Digital Network100,655
- J. Paul Getty Trust99,618
- Harvard Library92,066
- Northwest Digital Heritage86,342
- Vermont Green Mountain Digital Archive72,958
- Digital Virginias69,507
- Digital Maine63,492
- Orbis Cascade Alliance61,614
- District Digital57,753
- Texas Digital Library10,657
- Library of Congress4,481