- National Archives and Records Administration15,395,760
- Smithsonian Institution5,552,861
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,815,762
- The Portal to Texas History1,574,567
- Mountain West Digital Library1,106,130
- Digital Commonwealth847,313
- Digital Library of Georgia766,640
- Minnesota Digital Library753,562
- Michigan Service Hub748,321
- Internet Archive635,943
- North Carolina Digital Heritage Center580,654
- Recollection Wisconsin566,688
- Plains to Peaks Collective443,653
- Empire State Digital Network443,200
- OKHub428,056
- Indiana Memory427,770
- PA Digital424,315
- Illinois Digital Heritage Hub379,508
- Sunshine State Digital Network290,811
- South Carolina Digital Library248,888
- Biodiversity Heritage Library246,037
- Missouri Hub235,522
- Ohio Digital Network234,960
- United States Government Publishing Office (GPO)207,046
- University of Washington141,873
- Kentucky Digital Library141,677
- Digital Library of Tennessee134,709
- ARTstor134,475
- Digital Maryland103,790
- David Rumsey102,243
- J. Paul Getty Trust99,608
- Connecticut Digital Archive98,674
- Big Sky Country Digital Network93,944
- Harvard Library92,066
- Vermont Green Mountain Digital Archive72,137
- Digital Maine63,492
- Digital Virginias60,291
- District Digital57,753
- Library of Congress4,481