Colorado - Area of significance: Architecture
| Clatworthy Place |
| Clayton, George W., Trust and College |
| Clements Rowhouse |
| Cliff House |
| Clifton Community Center and Church |
| Clubhouse-Student Union |
| Coal Creek School |
| Coates Creek Schoolhouse |
| Cokedale Historic District |
| Colburn Hotel |
| Cole Neighborhood Historic District |
| Collins Block-Aspen Lumber and Supply |
| Colorado Amphitheater |
| Colorado and Southern Railway Depot |
| Colorado Building |
| Colorado Governor's Mansion |
| Colorado National Guard Armory |
| Colorado National Monument Visitor Center Complex |
| Colorado Sanitary Canning Factory |
| Colorado Springs Airport |
| Colorado Springs City Auditorium |
| Colorado Springs City Hall |
| Colorado Springs Day Nursery |
| Colorado Springs Fine Arts Center |
| Colorado Springs Public Library-Carnegie Building |
| Colorado State Capitol Annex Building and Boiler Plant |
| Colorado State Forest Building Complex |
| Colorado State Hospital Superintendent's House |
| Colorado Ute Power Plant |
| Colorado Woman's College |
| Colorado Women's Prison |
| Columbine |
| Comanche Drive-In |
| Commandant of Cadets Building, US Air Force Academy |
| Commercial Hotel |
| Como Roundhouse, Railroad Depot and Hotel Complex |
| Como School |
| Conifer Junction Schoolhouse |
| Coors, Herman, House |
| Corazon de Trinidad |
| Corbin, E.W., House |
| Cornwall Apartments |
| Coronado Lodge |
| Cortez High School |
| Cossitt, Frederick H., Memorial Hall |
| Country Club Historic District |
| Cozens Ranch House |
| Craig School #2 |
| Cranmer House |
| Crawford Hill Mansion |
| Crawford House |
| Crescent Moly Mine No. 100 and Mining Camp |
| Crested Butte Denver and Rio Grande Railroad Depot |
| Creswell Mansion |
| Crissey, Herbert and Edith, House |
| Crocker, F. W., and Company Steam Cracker Factory |
| Croke-Patterson-Campbell Mansion |
| Cross Land and Fruit Company Orchards and Ranch |
| Crow-Hightower House |
| Crowley School |
| Crystal Valley Cemetery |
| Curry-Chucovich House |
| Curtis-Champa Streets District |
| Curtis Hardware Store |
| Cutler Hall |
| Daniels and Fisher Tower |
| Daniels Park |
| Daniels School |
| Davies' Chuck Wagon Diner |
| Davies Hotel |
| Deaton Sculptured House |
| Debs School |
| Dedisse Park |
| DeGraff Building |
| DeLaney Barn |
| Delta County Bank Building |
| Delta Municipal Light & Power Plant |
| Denver and Rio Grande Depot |
| Denver and Rio Grande Western Railroad Depot |
| Denver Athletic Club |
| Denver City Cable Railway Building |
| Denver City Railway Company Building |
| Denver Civic Center Classroom Building |
| Denver Elevator-Grain Elevator |
| Denver Medical Depot |
| Denver Mint |
| Denver Orphans' Home |
| Denver Press Club |
| Denver Public Library |
| Deputy Warden's House |
| Devils Kitchen Picnic Shelter |
| Dexter Cabin |
| Dey Building |
| Deza Estates |
| Dickens Opera House |
| Dickinson Branch Library |
| District No. 17 School-Medlen School |
| Dixon-Markle House |
| Dodge-Hamlin House |
| Downtown Boulder Historic District |
Data from United States Park Service and Wikidata
