Colorado - Constructed - 1890–1899
| Bancroft, Caroline, House |
| Boston Building |
| Bouvier-Lothrop House |
| Bridge No. 10/Adelaide Bridge |
| Callahan, T. M., House |
| Chautauqua Auditorium |
| Croke-Patterson-Campbell Mansion |
| Crystal Mill |
| Delta County Bank Building |
| Doyle-Benton House |
| D & RG Narrow Gauge Trestle |
| Finney, Dr. Frank, House |
| Garnethurst |
| Gates, Russell and Elinor, Mansion |
| Goldfield City Hall and Fire Station |
| Gold Miner Hotel |
| Grand River Ditch |
| Hart, Wilson A., House |
| Highland School |
| Hotchkiss Hotel |
| Hotel Colorado |
| Kauffman, William, House |
| Kinner, John, House |
| LeFevre, Owen E., House |
| Meeker I.O.O.F. Lodge-Valentine Lodge No. 47 |
| Miramont |
| Ouray City Hall and Walsh Library |
| Oxford Hotel |
| Pitkin County Courthouse |
| Smith-Elisha House |
| Smith, Milo A., House |
| South High School |
| State Bridge |
| St. Elizabeth's Retreat Chapel |
| Stratton's Independence Mine and Mill |
| Tears-McFarlane House |
| Ticknor Hall |
| Tutt Building |
| Westcliff School |
| Westminster University |
| Wolfe, John, House |
Data from United States Park Service and Wikidata
