Colorado - Constructed - 1900–1909
| Adams County Courthouse |
| Alexander House |
| Altamaha Apartments |
| American National Bank Building |
| Annunciation Church |
| Antlers Cafe and Bar |
| Art Building |
| Atchison, Topeka and Santa Fe Railway Passenger Depot |
| Bode-Stewart House |
| Bross Hotel |
| Brown's Canyon Bridge |
| Carnegie Public Library |
| Colorado Governor's Mansion |
| Cortez High School |
| Crawford Hill Mansion |
| Davies Hotel |
| DeLaney Barn |
| Denver and Rio Grande Western Railroad Depot |
| Denver Mint |
| Denver Municipal Auditorium |
| Earl School |
| El Paso County Courthouse |
| Eppich Apartments |
| Evans-Elbert Ranch |
| First National Bank Building |
| Fort Morgan City Hall |
| Fox Stone Barn |
| F Street Bridge |
| Gas Creek School |
| Ginacci House |
| Gunnison Tunnel |
| Hotel Boulderado |
| Hoverhome and Hover Farmstead |
| Lebanon School |
| Lincoln School |
| Longmont Fire Department |
| Luft, Conrad, Sr., House |
| Mancos High School |
| Manhattan Hotel |
| McFadden Barn |
| Mesa Verde National Park |
| Montgomery Court |
| Palmer Hall |
| Prowers Bridge |
| Rifle Bridge |
| Salazar, A.A., House |
| Santa Fe Railway Water Tank |
| Satank Bridge |
| Sciumbato, Daniel, Grocery Store |
| Starr Manor |
| Steamboat Springs Depot |
| St. John's Cathedral |
| St. Mary's Catholic Church |
| Temple Emanuel |
| Valley View School |
| Walter, Martin, House |
| Wasson-McKay Place |
| Wrightsman House |
| Zang, Adolph, Mansion |
Data from United States Park Service and Wikidata
