- National Archives and Records Administration18,639,275
- Smithsonian Institution7,702,496
- HathiTrust3,033,985
- The Portal to Texas History2,198,268
- California Digital Library2,128,755
- Plains to Peaks Collective1,317,956
- Digital Commonwealth1,310,025
- Mountain West Digital Library1,289,352
- Michigan Service Hub1,177,510
- Digital Library of Georgia1,089,923
- Northwest Digital Heritage963,857
- OKHub837,861
- The New York Public Library807,042
- Heartland Hub802,443
- Minnesota Digital Library755,556
- PA Digital748,570
- Recollection Wisconsin738,205
- Internet Archive733,369
- Indiana Memory679,792
- Illinois Digital Heritage Hub565,756
- North Carolina Digital Heritage Center471,840
- Empire State Digital Network443,200
- Ohio Digital Network409,187
- Sunshine State Digital Network353,123
- South Carolina Digital Library313,966
- United States Government Publishing Office (GPO)305,718
- Biodiversity Heritage Library300,871
- NJ/DE Digital Collective271,920
- Digital Library of Tennessee214,075
- Kentucky Digital Library141,608
- Texas Digital Library137,858
- David Rumsey136,625
- Digital Maryland131,274
- Connecticut Digital Archive120,909
- Artstor108,681
- Harvard Library106,731
- J. Paul Getty Trust99,618
- Vermont Green Mountain Digital Archive91,573
- Digital Virginias73,614
- Digital Maine63,492
- District Digital57,753
- Big Sky Country Digital Network17,660
- Community Webs8,403
- Orbis Cascade Alliance7,598
- Library of Congress4,463