- Colorado State University. Libraries96,637
- Denver Public Library96,424
- University of Wyoming, American Heritage Center79,160
- History Colorado56,178
- Wyoming State Archives54,246
- University of Colorado Boulder University Libraries50,496
- Wyoming State Library48,882
- Fort Collins History Connection36,590
- Estes Park Museum25,925
- Pikes Peak Library District23,937
- Denver Museum of Nature and Science23,746
- University of Denver18,989
- Park County Archives, Wyoming14,860
- Colorado State Publications Library13,591
- Golden History Museum & Park11,053
- Eagle County Historical Society8,334
- Hot Springs County Museum & Cultural Center8,332
- Douglas County Libraries. Archives and Local History6,894
- The Brinton Museum6,120
- Carnegie Library for Local History, Boulder Public Library6,076
- University of Northern Colorado5,837
- Aurora History Museum5,672
- Campbell County Rockpile Museum5,548
- Louisville Historical Museum5,234
- City of Greeley Museums5,119
- Kit Carson County Archives3,709
- Pueblo City-County Library District2,716
- Colorado Snowsports Museum and Hall of Fame2,193
- CU Art Museum, University of Colorado Boulder1,509
- University of Wyoming1,415
- Park County Local History Digital Archive, Colorado1,369
- Leslie J. Savage Library1,352
- Fort Lewis College Foundation1,168
- Lakewood Heritage Center955
- Meeteetse Museums913
- USDA National Wildlife Research Center866
- Salida Regional Library623
- Museums of Western Colorado583
- Pine River Library513
- American Alpine Club464
- Clear Creek County Library District458
- Tread of Pioneers Museum437
- Colorado Railroad Museum436
- Broomfield Depot Museum432
- Lafayette Miners Museum416
- Colorado Parks & Wildlife Digital Collection320
- City of Thornton Archives Digital Collection304
- Salida Museum Association304
- Gunnison County Library District221
- University of Colorado Colorado Springs. Kraemer Family Library117
- Mesa County Libraries93
- Vail Public Library78
- Pitkin County Library59
- Colorado State University-Pueblo. Library52
- Front Range Community College37
- Ignacio Community Library31
- Pines and Plains Libraries Digital Collection27
- Old Town Hot Springs14
- Aspen Hall of Fame13
- Eagle Valley Library District12
- Black Citizens and Friends (Grand Junction, Colorado)7
- High Plains Library District7
- Stories of Colorado6
- Colorado State University. Libraries; Colorado State University. Libraries3
- Salida High School3
- Salida Fire Department2
- Fort Lewis College1
