- National Archives and Records Administration17,001,682
- Smithsonian Institution6,633,866
- HathiTrust3,033,985
- California Digital Library2,037,264
- The Portal to Texas History1,798,357
- Mountain West Digital Library1,216,685
- Michigan Service Hub1,088,963
- Digital Commonwealth925,452
- Digital Library of Georgia862,887
- Minnesota Digital Library844,521
- The New York Public Library787,630
- Plains to Peaks Collective738,124
- Internet Archive672,244
- PA Digital656,345
- North Carolina Digital Heritage Center649,444
- Recollection Wisconsin641,435
- OKHub583,835
- Missouri Hub572,972
- Illinois Digital Heritage Hub510,614
- Indiana Memory454,898
- Empire State Digital Network443,200
- Sunshine State Digital Network318,355
- Ohio Digital Network299,734
- Biodiversity Heritage Library266,793
- South Carolina Digital Library264,210
- United States Government Publishing Office (GPO)259,073
- Northwest Digital Heritage190,516
- NJ/DE Digital Collective168,932
- Digital Library of Tennessee145,956
- University of Washington141,873
- Kentucky Digital Library141,677
- ARTstor134,475
- Connecticut Digital Archive120,909
- David Rumsey114,437
- 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 Library16,554
- Library of Congress4,481