- National Archives and Records Administration15,395,760
- Smithsonian Institution5,245,019
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,750,466
- The Portal to Texas History1,508,467
- Mountain West Digital Library1,032,749
- Digital Commonwealth827,488
- Michigan Service Hub748,321
- Minnesota Digital Library748,278
- Digital Library of Georgia739,020
- Internet Archive634,480
- North Carolina Digital Heritage Center580,654
- Recollection Wisconsin574,222
- Empire State Digital Network443,200
- Indiana Memory428,706
- Plains to Peaks Collective427,563
- PA Digital417,090
- Illinois Digital Heritage Hub378,030
- OKHub364,702
- Sunshine State Digital Network285,850
- Biodiversity Heritage Library244,158
- Missouri Hub235,522
- Ohio Digital Network233,841
- South Carolina Digital Library210,297
- United States Government Publishing Office (GPO)207,046
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- Digital Library of Tennessee134,058
- Digital Maryland103,856
- David Rumsey100,463
- J. Paul Getty Trust99,598
- Big Sky Country Digital Network92,809
- Harvard Library92,066
- Connecticut Digital Archive89,339
- Vermont Green Mountain Digital Archive70,062
- Digital Maine63,492
- Digital Virginias60,291
- District Digital57,753
- Library of Congress4,481