- National Archives and Records Administration16,487,384
- Smithsonian Institution5,976,415
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,979,518
- The Portal to Texas History1,629,204
- Mountain West Digital Library1,195,958
- Michigan Service Hub940,898
- Digital Commonwealth909,296
- Minnesota Digital Library796,336
- Digital Library of Georgia785,744
- Internet Archive641,439
- Recollection Wisconsin610,567
- North Carolina Digital Heritage Center601,446
- Plains to Peaks Collective574,253
- Missouri Hub552,000
- PA Digital521,079
- OKHub469,912
- Empire State Digital Network443,200
- Indiana Memory429,644
- Illinois Digital Heritage Hub417,946
- Sunshine State Digital Network305,874
- South Carolina Digital Library254,785
- Biodiversity Heritage Library253,220
- Ohio Digital Network252,980
- United States Government Publishing Office (GPO)227,527
- University of Washington141,873
- Kentucky Digital Library141,677
- Digital Library of Tennessee141,434
- ARTstor134,475
- David Rumsey106,068
- Digital Maryland103,789
- Big Sky Country Digital Network100,823
- J. Paul Getty Trust99,618
- Connecticut Digital Archive98,674
- Harvard Library92,066
- Vermont Green Mountain Digital Archive73,548
- Digital Maine63,492
- Digital Virginias62,469
- District Digital57,753
- Library of Congress4,481
- Texas Digital Library4,243