- National Archives and Records Administration17,840,275
- Smithsonian Institution7,650,226
- HathiTrust3,033,985
- California Digital Library2,128,821
- The Portal to Texas History2,049,241
- Mountain West Digital Library1,208,508
- Michigan Service Hub1,160,654
- Digital Commonwealth1,151,823
- Digital Library of Georgia1,018,130
- Minnesota Digital Library939,259
- Plains to Peaks Collective931,982
- The New York Public Library797,171
- North Carolina Digital Heritage Center728,801
- Recollection Wisconsin725,389
- Internet Archive720,786
- OKHub714,470
- PA Digital710,040
- Indiana Memory660,183
- Heartland Hub647,562
- Northwest Digital Heritage628,316
- Illinois Digital Heritage Hub548,670
- Empire State Digital Network443,200
- Ohio Digital Network402,645
- NJ/DE Digital Collective331,206
- United States Government Publishing Office (GPO)295,591
- Biodiversity Heritage Library292,938
- Sunshine State Digital Network290,364
- South Carolina Digital Library286,587
- Digital Library of Tennessee198,433
- Kentucky Digital Library141,608
- David Rumsey128,178
- Digital Maryland126,963
- Connecticut Digital Archive120,909
- Artstor108,681
- Vermont Green Mountain Digital Archive101,034
- Texas Digital Library100,639
- J. Paul Getty Trust99,618
- Harvard Library98,023
- Digital Virginias70,776
- Digital Maine63,492
- Orbis Cascade Alliance61,404
- Big Sky Country Digital Network59,573
- District Digital57,753
- Community Webs4,901
- Library of Congress4,463