Colorado - Significance region: Local
| Church of the Brethren |
| Citizens National Bank Building |
| City Hall of Colorado City |
| Clayton, George W., Trust and College |
| Clements Rowhouse |
| Cleora Cemetery |
| Cliff Theater |
| Clifton Community Center and Church |
| Clubhouse-Student Union |
| Coal Creek School |
| Coates Creek Schoolhouse |
| Colburn Hotel |
| Cole Neighborhood Historic District |
| Collins Block-Aspen Lumber and Supply |
| Colorado Amphitheater |
| Colorado and Southern Railway Depot |
| Colorado Building |
| Colorado National Bank Building |
| Colorado National Guard Armory |
| Colorado River Bridge |
| Colorado Sanitary Canning Factory |
| Colorado Springs City Auditorium |
| Colorado Springs City Hall |
| Colorado Springs Public Library-Carnegie Building |
| Colorado State Forest Building Complex |
| Colorado State Hospital Superintendent's House |
| Colorado Woman's College |
| Colorow Point Park |
| Columbia Cemetery |
| Columbine |
| Comanche Drive-In |
| Commercial Hotel |
| Como Cemetery |
| Como Roundhouse, Railroad Depot and Hotel Complex |
| Como School |
| Congregational Church |
| Conifer Junction Schoolhouse |
| Convicts' Bread Oven |
| Coors, Herman, House |
| Corazon de Trinidad |
| Corbin, E.W., House |
| Coronado Lodge |
| Cortez High School |
| Corwina Park, O'Fallon Park, Pence Park |
| Cossitt, Frederick H., Memorial Hall |
| Cottonwood Creek Bridge |
| Crags Lodge |
| Craig, Katherine, Park |
| 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 |
| Crestone School |
| 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 |
| Crown Hill Burial Park |
| Crystola Bridge |
| Curry-Chucovich House |
| Curtis-Champa Streets District |
| Curtis Hardware Store |
| Curtis School |
| Cutler Hall |
| Daniels Park |
| Daniels School |
| De Beque House |
| Debs School |
| Dedisse Park |
| DeGraff Building |
| DeLaney Barn |
| Delta County Bank Building |
| Delta Municipal Light & Power Plant |
| Denver and Intermountain Railroad Interurban No. 25 |
| Denver and Rio Grande Depot |
| Denver and Rio Grande Railroad Depot |
| Denver and Rio Grande Railroad Locomotive No.169 |
| Denver and Rio Grande Western Railroad Caboose No. 0578 |
| Denver and Rio Grande Western Railroad Locomotive No. 315 |
| Denver Athletic Club |
| Denver City Cable Railway Building |
| Denver City Railway Company Building |
| Denver Civic Center Classroom Building |
| Denver-Colorado Springs-Pueblo Motor Way Company Inc. Garages |
| Denver Elevator-Grain Elevator |
| Denver Medical Depot |
| Denver Orphans' Home |
| Denver Press Club |
| Denver Public Library |
| Denver & Rio Grande Railroad South Fork Water Tank |
| Denver Tramway Powerhouse |
| Deputy Warden's House |
| Derry Mining Site Camp |
| Devils Head Lookout |
| Devils Kitchen Picnic Shelter |
Data from United States Park Service and Wikidata
