- National Archives and Records Administration12,974,419
- Smithsonian Institution3,274,465
- HathiTrust2,836,982
- The New York Public Library2,048,825
- The Portal to Texas History1,209,084
- University of Southern California Libraries1,170,914
- California Digital Library1,154,728
- Mountain West Digital Library1,093,258
- Digital Commonwealth647,303
- Digital Library of Georgia626,868
- Minnesota Digital Library621,464
- Internet Archive521,588
- Recollection Wisconsin509,749
- Empire State Digital Network443,200
- North Carolina Digital Heritage Center439,794
- PA Digital356,763
- Indiana Memory321,152
- Illinois Digital Heritage Hub307,310
- Michigan Service Hub270,215
- Biodiversity Heritage Library224,417
- Sunshine State Digital Network193,101
- United States Government Publishing Office (GPO)182,007
- South Carolina Digital Library179,815
- Missouri Hub169,836
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- OKHub114,806
- Digital Maryland102,537
- Ohio Digital Network100,757
- J. Paul Getty Trust99,082
- David Rumsey88,536
- Digital Library of Tennessee78,566
- Big Sky Country Digital Network71,086
- Digital Maine63,492
- Digital Virginias58,486
- District Digital57,753
- Plains to Peaks Collective46,842
- Harvard Library17,620
- Library of Congress4,481