- National Archives and Records Administration17,409,540
- Smithsonian Institution7,162,567
- HathiTrust3,033,985
- California Digital Library2,037,260
- The Portal to Texas History1,798,357
- Mountain West Digital Library1,216,685
- Michigan Service Hub1,094,805
- Digital Commonwealth956,025
- Digital Library of Georgia862,887
- Minnesota Digital Library852,657
- The New York Public Library787,630
- Plains to Peaks Collective716,962
- Internet Archive672,244
- PA Digital656,345
- Recollection Wisconsin646,977
- Missouri Hub643,532
- North Carolina Digital Heritage Center633,962
- OKHub583,835
- Illinois Digital Heritage Hub516,909
- Indiana Memory454,898
- Empire State Digital Network443,200
- Ohio Digital Network370,682
- Sunshine State Digital Network318,355
- Biodiversity Heritage Library272,247
- South Carolina Digital Library264,210
- United States Government Publishing Office (GPO)259,073
- Northwest Digital Heritage202,570
- NJ/DE Digital Collective179,317
- Digital Library of Tennessee145,956
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- Connecticut Digital Archive120,909
- David Rumsey115,758
- Digital Maryland113,640
- Big Sky Country Digital Network100,655
- J. Paul Getty Trust99,618
- Harvard Library92,066
- Digital Virginias90,729
- Vermont Green Mountain Digital Archive79,740
- Digital Maine63,492
- Orbis Cascade Alliance61,614
- District Digital57,753
- Texas Digital Library17,364
- Library of Congress4,481