Colorado - Criteria: A (event)
| Canyon (Canon) Creek School, District No. 32 |
| Capilla de San Isidro |
| Capilla de San Juan Bautista |
| Capilla de Viejo San Acacio |
| Cardiff Coke Ovens |
| Cardinal Mill |
| Carnegie Library |
| Carnegie Public Library |
| Carnegie Public Library |
| Cascade Boy Scout Camp |
| Castle Rock Depot |
| Cathedral of the Immaculate Conception |
| Cayton Guard Station |
| Central City-Black Hawk Historic District |
| Central City Opera House |
| Chadbourn Spanish Gospel Mission |
| Chaffee County Poor Farm |
| Chama Sociedad Proteccion Mutua de Trabajadores Unidos (SPMDTU) Lodge Hall |
| Chamberlin Observatory |
| Chamber of Commerce Building |
| Chambers Ranch |
| Chapel No. 1 |
| Chautauqua Auditorium |
| Cheesman Park |
| Cherokee Ranch |
| Cherry Creek Bridge |
| Chew, Rial, Ranch Complex |
| Cheyenne County Courthouse |
| Cheyenne County Jail |
| Christ Methodist Episcopal Church |
| Church of St. Philip-in-the-Field and Bear Canon Cemetery |
| Church of the Brethren |
| Citizens National Bank Building |
| City Hall of Colorado City |
| City Park |
| City Park Carousel |
| City Park Golf |
| Civic Center Historic District |
| Cleora Cemetery |
| Cliff House |
| Cliff Theater |
| Clifton Community Center and Church |
| Clubhouse-Student Union |
| Coates Creek Schoolhouse |
| Cokedale Historic District |
| Colorado Amphitheater |
| Colorado and Southern Railway Depot |
| Colorado Building |
| Colorado Chautauqua |
| Colorado Millennial Site |
| Colorado National Bank Building |
| Colorado National Guard Armory |
| Colorado National Monument Visitor Center Complex |
| Colorado River Bridge |
| Colorado Salt Works |
| Colorado Sanitary Canning Factory |
| Colorado Springs Airport |
| Colorado Springs and Cripple Creek District Railway-Corley Mountain Highway |
| Colorado Springs City Auditorium |
| Colorado Springs City Hall |
| Colorado Springs Day Nursery |
| Colorado Springs Public Library-Carnegie Building |
| Colorado State Capitol Annex Building and Boiler Plant |
| Colorado Ute Power Plant |
| Colorado Women's Prison |
| Columbia Cemetery |
| Columbine |
| Comanche Crossing of the Kansas Pacific Railroad |
| Commandant of Cadets Building, US Air Force Academy |
| Commercial Hotel |
| Como Cemetery |
| Como Roundhouse, Railroad Depot and Hotel Complex |
| Como School |
| Congregational Church |
| Conifer Junction Schoolhouse |
| Corazon de Trinidad |
| Corbin, E.W., House |
| Cortez High School |
| Cossitt, Frederick H., Memorial Hall |
| Cottonwood Creek Bridge |
| Cozens Ranch House |
| Crags Lodge |
| Cranmer Park |
| Crawford Hill Mansion |
| Crested Butte Denver and Rio Grande Railroad Depot |
| Crestone School |
| Cripple Creek Historic District |
| Crissey, Herbert and Edith, House |
| Crocker, F. W., and Company Steam Cracker Factory |
| Cross Land and Fruit Company Orchards and Ranch |
| Crown Hill Burial Park |
| Crystal Mill |
| Curtis Hardware Store |
| Curtis School |
| Cutler Hall |
| Daniels School |
| Davies' Chuck Wagon Diner |
| Dearfield |
| Debs School |
| Dedisse Park |
Data from United States Park Service and Wikidata
