- National Archives and Records Administration18,783,094
- Smithsonian Institution7,845,472
- HathiTrust3,033,985
- The Portal to Texas History2,390,742
- California Digital Library2,035,928
- Digital Commonwealth1,485,939
- Plains to Peaks Collective1,210,347
- Minnesota Digital Library1,191,995
- Northwest Digital Heritage1,174,886
- Mountain West Digital Library1,156,860
- Digital Library of Georgia1,149,945
- The New York Public Library1,009,185
- OKHub941,168
- Michigan Service Hub897,724
- Heartland Hub810,568
- Recollection Wisconsin800,437
- Internet Archive762,500
- North Carolina Digital Heritage Center757,343
- Indiana Memory682,733
- PA Digital671,634
- Illinois Digital Heritage Hub613,067
- Ohio Digital Network484,244
- Empire State Digital Network443,200
- NJ/DE Digital Collective357,990
- South Carolina Digital Library341,397
- United States Government Publishing Office (GPO)323,714
- Sunshine State Digital Network315,723
- Biodiversity Heritage Library310,146
- Digital Maryland259,864
- Digital Library of Tennessee229,063
- Texas Digital Library171,407
- David Rumsey144,647
- Kentucky Digital Library141,608
- Harvard Library121,203
- Connecticut Digital Archive120,909
- Artstor108,681
- J. Paul Getty Trust99,618
- Vermont Green Mountain Digital Archive91,650
- Digital Virginias66,639
- Digital Maine63,492
- Mississippi Digital Library47,237
- Jewish Heritage and History Hub20,230
- Big Sky Country Digital Network17,660
- Community Webs8,582
- Orbis Cascade Alliance7,597
- Library of Congress4,463