| 15 November 1941 | Territory Lost | Diocese of Denver (Mesa, Delta, Montrose, San Miguel, Ouray, Dolores, San Juan, Montezuma, La Plata, Gunnison, Chaffee, Sagauche, Hinsdale, Mineral, Archuleta, Conejos, Rio Grande, Alamosa, Fremont, Custer, Huenfano, Costilla, Pueblo, Crosley, Kiowa, Otero, Bent, Prowers...)
| Diocese of Pueblo (erected)
| | 10 November 1983 | Territory Lost | Archdiocese of Denver (Cheyenne, Douglas, Elbert, EI Paso, Kit Carson, Lake, Lincoln, Park, and Teller)
Diocese of Pueblo (Chaffee)
| Diocese of Colorado Springs (erected)
|