Colorado - Role: Building
| Commandant of Cadets Building, US Air Force Academy |
| Commercial Hotel |
| Como Roundhouse, Railroad Depot and Hotel Complex |
| Como School |
| Congregational Church |
| Conifer Junction Schoolhouse |
| Coors, Herman, House |
| Corbin, E.W., House |
| Cornwall Apartments |
| Coronado Lodge |
| Cortez High School |
| Cossitt, Frederick H., Memorial Hall |
| Cozens Ranch House |
| Crags Lodge |
| Craig School #2 |
| Cranmer House |
| Crawford Hill Mansion |
| Crawford House |
| Crested Butte Denver and Rio Grande Railroad Depot |
| Crestone School |
| Creswell Mansion |
| Crissey, Herbert and Edith, House |
| Crocker, F. W., and Company Steam Cracker Factory |
| Croke-Patterson-Campbell Mansion |
| Crow-Hightower House |
| Crowley School |
| Crystal Mill |
| Curry-Chucovich House |
| Curtis Hardware Store |
| Curtis School |
| Cutler Hall |
| Daniels and Fisher Tower |
| Daniels School |
| Davies' Chuck Wagon Diner |
| Davies Hotel |
| Deaton Sculptured House |
| De Beque House |
| Debs School |
| DeGraff Building |
| DeLaney Barn |
| Delta County Bank Building |
| Delta Municipal Light & Power Plant |
| Denver and Rio Grande Depot |
| Denver and Rio Grande Railroad Depot |
| Denver and Rio Grande Western Railroad Depot |
| Denver Athletic Club |
| Denver City Cable Railway Building |
| Denver City Railway Company Building |
| Denver Civic Center |
| Denver Civic Center Classroom Building |
| Denver-Colorado Springs-Pueblo Motor Way Company Inc. Garages |
| Denver Dry Goods Company Building |
| Denver Elevator-Grain Elevator |
| Denver Mint |
| Denver Municipal Auditorium |
| Denver Orphans' Home |
| Denver Press Club |
| Denver Public Library |
| Denver Tramway Powerhouse |
| Deputy Warden's House |
| Devils Kitchen Picnic Shelter |
| Dexter Cabin |
| Dey Building |
| Dickens Opera House |
| Dickinson Branch Library |
| District No. 17 School-Medlen School |
| Dixon-Markle House |
| Dodge-Hamlin House |
| Doud, John and Elvira, House |
| Downtown Denver Central YMCA and Annex |
| Dow-Rosenzweig House |
| Doyle-Benton House |
| Duke, Nathaniel W., House |
| Dumont School |
| Dunning-Benedict House |
| Dunraven Cottage-Camp Dunraven |
| Dunwoody, William J., House |
| Durango High School |
| Dutzi, Howard & Ruth, House |
| Dyer, Samuel, House |
| Eads Community Church |
| Eads School Gymnasium |
| Earl School |
| Earnest Ranch |
| East High School |
| Eastholme |
| East Street School |
| Eaton, Aaron James, House |
| Edgemont |
| Edgeplain |
| Edgerton House |
| Edison School |
| Egyptian Theater |
| Eighth Street Baptist Church |
| Eleventh Avenue Hotel |
| Elitch Theatre |
| El Monte Hotel |
| El Paso County Courthouse |
| Elsner, John, House |
| Emerick, Charles, House |
Data from United States Park Service and Wikidata
