- National Archives and Records Administration15,395,760
- Smithsonian Institution5,552,861
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,750,466
- The Portal to Texas History1,552,546
- Mountain West Digital Library1,106,130
- Digital Commonwealth827,488
- Digital Library of Georgia766,640
- Michigan Service Hub748,321
- Minnesota Digital Library748,278
- Internet Archive635,943
- North Carolina Digital Heritage Center580,654
- Recollection Wisconsin574,222
- Empire State Digital Network443,200
- Indiana Memory428,706
- OKHub428,056
- Plains to Peaks Collective427,563
- PA Digital417,090
- Illinois Digital Heritage Hub378,030
- Sunshine State Digital Network290,811
- South Carolina Digital Library248,888
- Biodiversity Heritage Library246,037
- Missouri Hub235,522
- Ohio Digital Network233,841
- 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 Rumsey102,243
- J. Paul Getty Trust99,608
- Big Sky Country Digital Network92,648
- Harvard Library92,066
- Connecticut Digital Archive89,339
- Vermont Green Mountain Digital Archive70,950
- Digital Maine63,492
- Digital Virginias60,291
- District Digital57,753
- Library of Congress4,481