- National Archives and Records Administration15,990,396
- Smithsonian Institution5,821,997
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,957,561
- The Portal to Texas History1,605,001
- Mountain West Digital Library1,195,958
- Digital Commonwealth904,623
- Digital Library of Georgia785,744
- Minnesota Digital Library778,952
- Internet Archive641,439
- Recollection Wisconsin605,648
- North Carolina Digital Heritage Center582,814
- Missouri Hub552,000
- Plains to Peaks Collective506,691
- OKHub445,178
- Empire State Digital Network443,200
- PA Digital435,804
- Indiana Memory430,400
- Michigan Service Hub410,981
- Illinois Digital Heritage Hub382,479
- Sunshine State Digital Network299,771
- South Carolina Digital Library254,785
- Biodiversity Heritage Library250,606
- Ohio Digital Network236,625
- United States Government Publishing Office (GPO)227,527
- University of Washington141,873
- Kentucky Digital Library141,677
- Digital Library of Tennessee137,340
- ARTstor134,475
- Digital Maryland103,790
- David Rumsey102,243
- J. Paul Getty Trust99,618
- Big Sky Country Digital Network99,479
- Connecticut Digital Archive98,674
- Harvard Library92,066
- Vermont Green Mountain Digital Archive73,548
- Digital Maine63,492
- Digital Virginias62,470
- District Digital57,753
- Library of Congress4,481
- Texas Digital Library3,392