- National Archives and Records Administration13,217,067
- Smithsonian Institution3,560,110
- HathiTrust2,836,982
- The New York Public Library2,048,825
- The Portal to Texas History1,272,725
- California Digital Library1,249,391
- University of Southern California Libraries1,207,408
- Mountain West Digital Library1,072,626
- Digital Commonwealth699,345
- Minnesota Digital Library682,736
- Digital Library of Georgia644,382
- Internet Archive591,621
- Recollection Wisconsin518,846
- Empire State Digital Network443,199
- North Carolina Digital Heritage Center416,383
- PA Digital390,194
- Indiana Memory330,707
- Illinois Digital Heritage Hub312,969
- Michigan Service Hub271,432
- Biodiversity Heritage Library227,914
- Missouri Hub227,799
- Plains to Peaks Collective224,715
- Sunshine State Digital Network212,683
- South Carolina Digital Library200,615
- United States Government Publishing Office (GPO)191,237
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- Digital Maryland102,485
- Ohio Digital Network102,263
- J. Paul Getty Trust99,442
- OKHub97,611
- David Rumsey90,001
- Digital Library of Tennessee88,094
- Big Sky Country Digital Network84,827
- Connecticut Digital Archive76,313
- Digital Maine63,492
- Digital Virginias58,486
- District Digital57,753
- Harvard Library17,620
- Library of Congress4,481