- Denver Public Library106,882
- Colorado State University. Libraries90,484
- University of Wyoming, American Heritage Center85,284
- History Colorado61,490
- Wyoming State Archives55,610
- University of Colorado Boulder University Libraries49,898
- Wyoming State Library48,882
- Fort Collins History Connection37,644
- Estes Park Museum25,924
- Pikes Peak Library District25,520
- Denver Museum of Nature and Science23,746
- University of Denver18,947
- Park County Archives, Wyoming14,860
- Colorado State Publications Library13,888
- Golden History Museum & Park11,748
- Eagle County Historical Society8,632
- Douglas County Libraries. Archives and Local History8,075
- Carnegie Library for Local History, Boulder Public Library6,087
- University of Northern Colorado5,907
- Fort Caspar Museum5,822
- Campbell County Rockpile Museum5,548
- City of Greeley Museums5,119
- Aurora History Museum3,785
- Pueblo City-County Library District2,716
- Kit Carson County Archives2,390
- Colorado Snowsports Museum and Hall of Fame2,262
- CU Art Museum, University of Colorado Boulder1,509
- Park County Local History Digital Archive, Colorado1,420
- University of Wyoming1,415
- Leslie J. Savage Library1,352
- Fort Lewis College Foundation1,169
- Lakewood Heritage Center955
- Meeteetse Museums913
- USDA National Wildlife Research Center907
- Security Public Library745
- Salida Regional Library627
- Museums of Western Colorado614
- Pine River Library502
- Clear Creek County Library District458
- American Alpine Club446
- Tread of Pioneers Museum438
- Colorado Railroad Museum436
- Broomfield Depot Museum432
- Lafayette Miners Museum416
- Colorado Parks & Wildlife Digital Collection339
- City of Thornton Archives Digital Collection305
- Salida Museum Association304
- Gunnison County Library District283
- University of Colorado Colorado Springs. Kraemer Family Library117
- Mesa County Libraries113
- Pitkin County Library78
- Vail Public Library78
- Colorado State University-Pueblo. Library52
- Front Range Community College37
- Ignacio Community Library31
- National Federation of the Blind of Colorado31
- Pines and Plains Libraries Digital Collection27
- Aspen Hall of Fame15
- Old Town Hot Springs14
- Eagle Valley Library District12
- Front Range Community College Larimer Campus9
- Black Citizens and Friends (Grand Junction, Colorado)7
- High Plains Library District7
- Stories of Colorado6
- Salida High School3
- Salida Fire Department2
- Fort Lewis College1
