- National Archives and Records Administration15,893,880
- Smithsonian Institution5,776,688
- HathiTrust3,033,985
- The New York Public Library2,048,825
- California Digital Library1,957,563
- The Portal to Texas History1,589,846
- Mountain West Digital Library1,129,389
- Michigan Service Hub871,380
- Digital Commonwealth847,313
- Digital Library of Georgia781,477
- Minnesota Digital Library684,545
- Internet Archive637,476
- North Carolina Digital Heritage Center580,654
- Recollection Wisconsin565,916
- OKHub445,103
- Plains to Peaks Collective443,653
- Empire State Digital Network443,200
- PA Digital435,804
- Indiana Memory430,400
- Illinois Digital Heritage Hub382,479
- Sunshine State Digital Network293,629
- Biodiversity Heritage Library250,606
- South Carolina Digital Library248,888
- Ohio Digital Network236,625
- Missouri Hub235,522
- United States Government Publishing Office (GPO)224,301
- University of Washington141,873
- Kentucky Digital Library141,677
- Digital Library of Tennessee137,340
- ARTstor134,475
- Digital Maryland103,790
- David Rumsey102,243
- J. Paul Getty Trust99,606
- Connecticut Digital Archive98,674
- Big Sky Country Digital Network98,434
- Harvard Library92,066
- Vermont Green Mountain Digital Archive69,970
- Digital Maine63,492
- Digital Virginias62,470
- District Digital57,753
- Library of Congress4,481
- Texas Digital Library3,392