Colorado - Criteria: C (architecture/engineering)
| Bridge No. 10/Adelaide Bridge |
| Bridge over Arkansas River |
| Bridge over Burro Canon |
| Bridge over Fountain Creek |
| Brighton High School |
| Bromide Charcoal Kilns |
| Bromley Farm-Koizuma Hishinuma Farm |
| Brook Forest Inn |
| Bross Hotel |
| Brown, David W., House |
| Brown, J. S., Mercantile Building |
| Brown, Molly, House |
| Brown Palace Hotel |
| Brown's Canyon Bridge |
| Brueger Brothers Building and Annex |
| Brush, Jared L., Barn |
| Bryan Hose House |
| Buchtel Bungalow |
| Buckeye School |
| Building at 1389 Stuart Street |
| Building at 1390 Stuart Street |
| Building at 1435 Stuart Street |
| Building at 1444 Stuart Street |
| Building at 1471 Stuart Street |
| Burgess House |
| Burlington Gymnasium |
| Burlington Hotel |
| Burlington State Armory |
| Butler House |
| Butters, Alfred, House |
| Byers-Evans House |
| Callahan, Matthew, Log Cabin |
| Callahan, T. M., House |
| Calvary Episcopal Church |
| Campbell, Richard Crawford, House |
| Camp George West Historic District |
| Canon City Downtown Historic District |
| Canon City Municipal Building |
| Canon City State Armory |
| Canyon (Canon) Creek School, District No. 32 |
| Capilla de San Isidro |
| Capilla de San Juan Bautista |
| Capilla de Viejo San Acacio |
| Cardinal Mill |
| Carlile, James N., House |
| Carlton House |
| Carnegie Library |
| Carnegie Public Library |
| Carnegie Public Library |
| Carter-Rice Building |
| Cascade Boy Scout Camp |
| Castle Rock Depot |
| Cathedral of the Immaculate Conception |
| Cayton Guard Station |
| Central City Opera House |
| Central High School |
| Central Presbyterian Church |
| Chaffee County Courthouse and Jail Buildings |
| Chama Sociedad Proteccion Mutua de Trabajadores Unidos (SPMDTU) Lodge Hall |
| Chamberlin Observatory |
| Chamber of Commerce Building |
| Chamber of Commerce Building |
| Chambers Ranch |
| Chapel No. 1 |
| Chappell, Delos Allen, House |
| Chateau, The |
| Cheesman Park |
| Cheesman Park Duplex |
| Cherokee Ranch |
| Cherry Creek Bridge |
| Cheyenne County Courthouse |
| Cheyenne County Jail |
| Christ Episcopal Church |
| Christian Science Society Building |
| 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 |
| Claremont |
| Clatworthy Place |
| Clements Rowhouse |
| Cliff House |
| Clifton Community Center and Church |
| Clubhouse-Student Union |
| Coates Creek Schoolhouse |
| Cokedale Historic District |
| Collins Block-Aspen Lumber and Supply |
| Colorado Amphitheater |
| Colorado and Southern Railway Depot |
| Colorado Building |
| Colorado Governor's Mansion |
| Colorado National Bank Building |
| Colorado National Guard Armory |
| Colorado National Monument Visitor Center Complex |
| Colorado River Bridge |
| Colorado Salt Works |
Data from United States Park Service and Wikidata
