- Denver Public Library95,991
- Colorado State University. Libraries89,237
- University of Wyoming, American Heritage Center79,106
- Wyoming State Archives54,006
- History Colorado54,001
- Fort Collins History Connection48,070
- University of Colorado Boulder University Libraries45,759
- Wyoming State Library45,455
- Estes Park Museum25,924
- Denver Museum of Nature and Science23,746
- Pikes Peak Library District22,655
- University of Denver17,432
- Park County Archives, Wyoming14,860
- Colorado State Publications Library13,215
- Golden History Museum & Park10,183
- Hot Springs County Museum & Cultural Center8,332
- Eagle County Historical Society8,024
- The Brinton Museum6,120
- Carnegie Library for Local History, Boulder Public Library6,097
- Aurora History Museum5,672
- University of Northern Colorado5,624
- Campbell County Rockpile Museum5,548
- Louisville Historical Museum5,234
- City of Greeley Museums5,119
- Kit Carson County Archives3,784
- Pueblo City-County Library District2,716
- Colorado Snowsports Museum and Hall of Fame2,153
- CU Art Museum, University of Colorado Boulder1,509
- University of Wyoming1,415
- Park County Local History Digital Archive, Colorado1,356
- Leslie J. Savage Library1,352
- Fort Lewis College Foundation1,164
- Lakewood Heritage Center955
- Meeteetse Museums913
- USDA National Wildlife Research Center866
- Salida Regional Library623
- Museums of Western Colorado521
- Pine River Library513
- American Alpine Club464
- Clear Creek County Library District458
- Tread of Pioneers Museum437
- Colorado Railroad Museum436
- Broomfield Depot Museum432
- Lafayette Miners Museum416
- City of Thornton Archives Digital Collection304
- Salida Museum Association304
- Colorado Parks & Wildlife Digital Collection230
- Gunnison County Library District159
- University of Wyoming Art Museum154
- University of Colorado Colorado Springs. Kraemer Family Library105
- Mesa County Libraries91
- Vail Public Library78
- Pitkin County Library59
- Front Range Community College37
- Colorado State University-Pueblo. Library35
- Ignacio Community Library31
- Pines and Plains Libraries Digital Collection27
- Old Town Hot Springs14
- Aspen Hall of Fame13
- Eagle Valley Library District12
- High Plains Library District7
- Black Citizens and Friends (Grand Junction, Colorado)6
- Stories of Colorado6
- Salida High School3
- Salida Fire Department2
- Fort Lewis College1
