- National Archives and Records Administration3,781,862
- Smithsonian Institution2,923,050
- HathiTrust2,745,120
- The New York Public Library1,907,303
- University of Southern California Libraries1,170,914
- The Portal to Texas History1,079,768
- California Digital Library1,047,750
- Mountain West Digital Library968,285
- Minnesota Digital Library621,464
- Digital Library of Georgia602,306
- Digital Commonwealth542,648
- Recollection Wisconsin490,044
- Internet Archive448,166
- North Carolina Digital Heritage Center439,794
- Empire State Digital Network416,953
- PA Digital333,240
- Indiana Memory307,943
- Illinois Digital Heritage Hub283,021
- Michigan Service Hub246,628
- Biodiversity Heritage Library215,328
- Digital Library of Tennessee181,262
- South Carolina Digital Library179,815
- United States Government Publishing Office (GPO)178,505
- Sunshine State Digital Network169,973
- Missouri Hub169,836
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor133,741
- OKHub111,717
- Digital Maryland102,252
- Ohio Digital Network99,234
- J. Paul Getty Trust99,080
- David Rumsey86,114
- Big Sky Country Digital Network64,956
- Digital Maine63,492
- District Digital57,757
- Plains to Peaks Collective46,842
- University of Virginia Library30,174
- Harvard Library17,620
- Library of Congress4,481