Changes in Ecclesiastical Jurisdictions
in USA
Changes in Ecclesiastical Jurisdictionsin USA | |
Date | Change |
| 1784.11.26 | Apostolic Prefecture of United States of America was established (from Diocese of Québec and Apostolic Vicariate of London District) |
| 1789.11.06 | Apostolic Prefecture of United States of America was promoted as Diocese of Baltimore |
| 1793.04.25 | Diocese of Louisiana and the Two Floridas was established (from Diocese of La Habana and became suffragan of Santo Domingo) |
| 1808.04.08 | Diocese of Baltimore was promoted as Metropolitan Archdiocese of Baltimore (with suffragan sees Bardstown, Boston, New York and Philadelphia and lost territory to establish Diocese of Bardstown, Diocese of Boston, Diocese of New York and Diocese of Philadelphia) |
| 1808.04.08 | Diocese of Bardstown was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.08 | Diocese of Boston was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.08 | Diocese of New York was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1808.04.08 | Diocese of Philadelphia was established (from Diocese of Baltimore and became suffragan of Baltimore) |
| 1820.07.11 | Diocese of Charleston was established (from Metropolitan Archdiocese of Baltimore and became suffragan of Baltimore) |
| 1820.07.11 | Diocese of Richmond was established (from Metropolitan Archdiocese of Baltimore and became suffragan of Baltimore) |
| 1821.06.19 | Diocese of Cincinnati was established (from Diocese of Bardstown and became suffragan of Baltimore) |
| 1822.08.13 | Apostolic Vicariate of Mississippi and Alabama was established (from Diocese of Louisiana and the Two Floridas) |
| 1823.01.21 | Diocese of Louisiana and the Two Floridas lost territory to Apostolic Vicariate of Mississippi and Alabama |
| 1823.07.14 | Apostolic Vicariate of Mississippi and Alabama was suppressed (to Diocese of Louisiana and the Two Floridas) |
| 1825.08.19 | Apostolic Vicariate of Mississippi was restored (from Diocese of Louisiana and the Two Floridas) |
| 1825.08.29 | Apostolic Vicariate of Alabama and the Floridas was established (from Metropolitan Archdiocese of Baltimore and Diocese of Louisiana and the Two Floridas) |
| 1825.08.29 | Diocese of Louisiana and the Two Floridas was renamed as Diocese of Louisiana (lost territory to establish Apostolic Vicariate of Alabama and the Floridas) |
| 1825.11.27 | Apostolic Prefecture of Sandwich Islands was established |
| 1826.07.18 | Apostolic Vicariate of Mississippi was suppressed (to Diocese of New Orleans) |
| 1826.07.18 | Diocese of Louisiana was renamed as Diocese of New Orleans (gained territory from the suppressed Apostolic Vicariate of Mississippi and lost territory to establish Diocese of Saint Louis) |
| 1826.07.18 | Diocese of Saint Louis was established (from Diocese of Durango and Diocese of Louisiana and without ecclesiastical province) |
| 1829.05.15 | Apostolic Vicariate of Alabama and the Floridas was promoted as Diocese of Mobile (became suffragan of Baltimore) |
| 1833.03.08 | Diocese of Detroit was established (from Diocese of Cincinnati and became suffragan of Baltimore) |
| 1834.05.06 | Diocese of Vincennes was established (from Diocese of Bardstown and became suffragan of Baltimore) |
| 1837.07.28 | Diocese of Dubuque was established (from Diocese of Saint Louis and became suffragan of Baltimore) |
| 1837.07.28 | Diocese of Nashville was established (from Diocese of Bardstown and became suffragan of Baltimore) |
| 1837.07.28 | Diocese of Natchez was restored (without ecclesiastical province) |
| 1839 | Apostolic Prefecture of Texas was established (from Diocese of Linares) |
| 1840.04.27 | Diocese of California was established (from Diocese of Sonora and became suffragan of México) |
| 1841.02.13 | Diocese of Bardstown was suppressed (to establish Diocese of Louisville) |
| 1841.02.13 | Diocese of Louisville was established (from the suppressed Diocese of Bardstown and became suffragan of Baltimore) |
| 1841.07.10 | Apostolic Prefecture of Texas was promoted as Apostolic Vicariate of Texas |
| 1843.08.11 | Diocese of Pittsburgh was established (from Diocese of Philadelphia and became suffragan of Baltimore) |
| 1843.11.28 | Diocese of Chicago was established (from Diocese of Saint Louis and Diocese of Vincennes and became suffragan of Baltimore) |
| 1843.11.28 | Diocese of Hartford was established (from Diocese of Boston and became suffragan of Baltimore) |
| 1843.11.28 | Diocese of Little Rock was established (from Diocese of Saint Louis and became suffragan of Baltimore) |
| 1843.11.28 | Diocese of Milwaukee was established (from Diocese of Detroit and became suffragan of Baltimore) |
| 1843.12.01 | Apostolic Vicariate of Oregon was established (from Metropolitan Archdiocese of Baltimore and Archdiocese of Québec) |
| 1844.08.13 | Apostolic Prefecture of Sandwich Islands was promoted as Apostolic Vicariate of Sandwich Islands |
| 1846.07.24 | Apostolic Vicariate of Oregon was promoted as Metropolitan Archdiocese of Oregon City (with suffragan sees Vancouver Island and Walla Walla and lost territory to establish Diocese of Vancouver Island and Diocese of Walla Walla) |
| 1846.07.24 | Diocese of Walla Walla was established (from Apostolic Vicariate of Oregon and became suffragan of Oregon City) |
| 1847.04.23 | Diocese of Albany was established (from Diocese of New York and became suffragan of Baltimore) |
| 1847.04.23 | Diocese of Buffalo was established (from Diocese of New York and became suffragan of Baltimore) |
| 1847.04.23 | Diocese of Cleveland was established (from Diocese of Cincinnati and became suffragan of Baltimore) |
| 1847.05.04 | Apostolic Vicariate of Texas was promoted as Diocese of Galveston (became suffragan of Baltimore) |
| 1847.07.11 | Apostolic Vicariate of Sandwich Islands was renamed as Apostolic Vicariate of Hawaiian Islands |
| 1847.07.20 | Diocese of Saint Louis was promoted as Metropolitan Archdiocese of Saint Louis (with suffragan see Dubuque) |
| 1849.11.20 | Diocese of California was suppressed (to establish Diocese of Monterey) |
| 1849.11.20 | Diocese of Monterey was established (from the suppressed Diocese of California and without ecclesiastical province) |
| 1850.05.31 | Diocese of Nesqually was established (from Diocese of Walla Walla and became suffragan of Oregon City) |
| 1850.07.03 | Diocese of Savannah was established (from Diocese of Charleston and Diocese of Mobile and became suffragan of Baltimore) |
| 1850.07.19 | Diocese of Cincinnati was promoted as Metropolitan Archdiocese of Cincinnati (with suffragan sees Cleveland, Detroit, Louisville, Nashville and Vincennes) |
| 1850.07.19 | Apostolic Vicariate of Indian Territory East of the Rocky Mountains was established (from Diocese of New Orleans) |
| 1850.07.19 | Diocese of New Orleans was promoted as Metropolitan Archdiocese of New Orleans (with suffragan sees Galveston, Little Rock, Mobile and Natchez and lost territory to establish Apostolic Vicariate of Indian Territory East of the Rocky Mountains) |
| 1850.07.19 | Diocese of New York was promoted as Metropolitan Archdiocese of New York (with suffragan sees Albany, Boston, Buffalo and Hartford) |
| 1850.07.19 | Diocese of Saint Paul was established (from Diocese of Dubuque and Diocese of Milwaukee and became suffragan of Saint Louis) |
| 1850.07.19 | Diocese of Wheeling was established (from Diocese of Richmond and became suffragan of Baltimore) |
| 1850.07.23 | Apostolic Vicariate of New Mexico was established (from Diocese of Durango) |
| 1851.12.21 | Diocese of Monterey lost territory to Metropolitan Archdiocese of México |
| 1853.07.29 | Diocese of Brooklyn was established (from Metropolitan Archdiocese of New York and became suffragan of New York) |
| 1853.07.29 | Diocese of Burlington was established (from Diocese of Boston and became suffragan of New York) |
| 1853.07.29 | Diocese of Covington was established (from Diocese of Louisville and became suffragan of Cincinnati) |
| 1853.07.29 | Diocese of Erie was established (from Diocese of Pittsburgh and became suffragan of Baltimore) |
| 1853.07.29 | Diocese of Natchitoches was established (from Metropolitan Archdiocese of New Orleans and became suffragan of New Orleans) |
| 1853.07.29 | Diocese of Newark was established (from Metropolitan Archdiocese of New York and Diocese of Philadelphia and became suffragan of New York) |
| 1853.07.29 | Diocese of Portland in Maine was established (from Diocese of Boston and became suffragan of New York) |
| 1853.07.29 | Diocese of Quincy was established (from Diocese of Chicago and became suffragan of Baltimore) |
| 1853.07.29 | Metropolitan Archdiocese of San Francisco was established (from Diocese of Monterey and with suffragan see Monterey) |
| 1853.07.29 | Apostolic Vicariate of New Mexico was promoted as Diocese of Santa Fe (became suffragan of Saint Louis) |
| 1853.07.29 | Apostolic Vicariate of Upper Michigan was established (from Diocese of Detroit) |
| 1853.07.29 | Diocese of Walla Walla was suppressed (to Diocese of Nesqually) |
| 1857.01.06 | Apostolic Vicariate of Indian Territory East of the Rocky Mountains was renamed as Apostolic Vicariate of Kansas (lost territory to establish Apostolic Vicariate of Nebraska) |
| 1857.01.06 | Apostolic Vicariate of Nebraska was established (from Apostolic Vicariate of Indian Territory East of the Rocky Mountains) |
| 1857.01.08 | Diocese of Fort Wayne was established (from Diocese of Vincennes and became suffragan of Cincinnati) |
| 1857.01.09 | Diocese of Alton was established (from the suppressed Diocese of Quincy and became suffragan of Baltimore) |
| 1857.01.09 | Apostolic Vicariate of Florida was established (from Diocese of Savannah) |
| 1857.01.09 | Diocese of Quincy was suppressed (to establish Diocese of Alton) |
| 1857.01.09 | Apostolic Vicariate of Upper Michigan was promoted as Diocese of Sault Sainte Marie (became suffragan of Cincinnati) |
| 1858.08.15 | Metropolitan Archdiocese of Baltimore lost territory to Diocese of Richmond |
| 1859.07.07 | Diocese of Monterey was renamed as Diocese of Monterey–Los Angeles |
| 1860.09.27 | Apostolic Vicariate of Marysville was established (from Metropolitan Archdiocese of San Francisco) |
| 1865.10.23 | Diocese of Sault Sainte Marie was renamed as Diocese of Sault Sainte Marie–Marquette |
| 1868.02.05 | Apostolic Vicariate of Colorado and Utah was established (from Diocese of Santa Fe) |
| 1868.03.03 | Diocese of Columbus was established (from Metropolitan Archdiocese of Cincinnati and became suffragan of Cincinnati) |
| 1868.03.03 | Diocese of Green Bay was established (from Diocese of Milwaukee and became suffragan of Saint Louis) |
| 1868.03.03 | Diocese of Harrisburg was established (from Diocese of Philadelphia and became suffragan of Baltimore) |
| 1868.03.03 | Apostolic Vicariate of Idaho and Montana was established (from Metropolitan Archdiocese of Oregon City) |
| 1868.03.03 | Diocese of La Crosse was established (from Diocese of Milwaukee and became suffragan of Saint Louis) |
| 1868.03.03 | Apostolic Vicariate of Montana was established (from Apostolic Vicariate of Nebraska) |
| 1868.03.03 | Apostolic Vicariate of North Carolina was established (from Diocese of Charleston) |
| 1868.03.03 | Diocese of Rochester was established (from Diocese of Buffalo and became suffragan of New York) |
| 1868.03.03 | Diocese of Saint Joseph was established (from Metropolitan Archdiocese of Saint Louis and became suffragan of Saint Louis) |
| 1868.03.03 | Diocese of Scranton was established (from Diocese of Philadelphia and became suffragan of Baltimore) |
| 1868.03.03 | Diocese of Wilmington was established (from Metropolitan Archdiocese of Baltimore and Diocese of Philadelphia and became suffragan of Baltimore) |
| 1868.03.22 | Apostolic Vicariate of Marysville was promoted as Diocese of Grass Valley (became suffragan of San Francisco) |
| 1868.09.25 | Apostolic Vicariate of Arizona was established (from Diocese of Santa Fe) |
| 1870 | Apostolic Vicariate of Colorado and Utah was renamed as Apostolic Vicariate of Colorado |
| 1870.03.11 | Apostolic Vicariate of Florida was promoted as Diocese of Saint Augustine (became suffragan of Baltimore) |
| 1870.06.14 | Diocese of Springfield in Massachusetts was established (from Diocese of Boston and became suffragan of New York) |
| 1872.02.15 | Diocese of Ogdensburg was established (from Diocese of Albany and became suffragan of New York) |
| 1872.02.16 | Diocese of Providence was established (from Diocese of Boston and Diocese of Hartford and became suffragan of New York) |
| 1874.05.28 | Diocese of Wilmington lost territory to Diocese of Richmond |
| 1874.08.28 | Apostolic Vicariate of Brownsville was established (from Diocese of Galveston) |
| 1874.08.28 | Diocese of San Antonio was established (from Diocese of Galveston and became suffragan of New Orleans) |
| 1875.02.12 | Diocese of Boston was promoted as Metropolitan Archdiocese of Boston (with suffragan sees Burlington, Portland in Maine and Springfield in Massachusetts) |
| 1875.02.12 | Diocese of Milwaukee was promoted as Metropolitan Archdiocese of Milwaukee (with suffragan sees Green Bay, La Crosse and Sault Sainte Marie–Marquette) |
| 1875.02.12 | Apostolic Vicariate of Northern Minnesota was established (from Diocese of Saint Paul) |
| 1875.02.12 | Diocese of Peoria was established (from Diocese of Chicago and became suffragan of Baltimore) |
| 1875.02.12 | Diocese of Philadelphia was promoted as Metropolitan Archdiocese of Philadelphia (with suffragan sees Erie, Harrisburg, Pittsburgh and Scranton) |
| 1875.02.12 | Diocese of Santa Fe was promoted as Metropolitan Archdiocese of Santa Fe |
| 1876.01.11 | Diocese of Allegheny was established (from Diocese of Pittsburgh and became suffragan of Philadelphia) |
| 1876.05.14 | Apostolic Prefecture of Indian Territory was established (from Diocese of Little Rock) |
| 1877.05.22 | Apostolic Vicariate of Kansas was promoted as Diocese of Leavenworth (became suffragan of Saint Louis) |
| 1879.08.12 | Apostolic Vicariate of Dakota was established (from Diocese of Saint Paul and became suffragan of Saint Louis) |
| 1880.09.10 | Diocese of Chicago was promoted as Metropolitan Archdiocese of Chicago (with suffragan sees Alton and Peoria) |
| 1880.09.10 | Diocese of Kansas City was established (from Metropolitan Archdiocese of Saint Louis and became suffragan of Saint Louis) |
| 1881.06.14 | Diocese of Davenport was established (from Diocese of Dubuque and became suffragan of Saint Louis) |
| 1881.08.02 | Diocese of Trenton was established (from Diocese of Newark and became suffragan of New York) |
| 1882.05.19 | Diocese of Grand Rapids was established (from Diocese of Detroit and became suffragan of Cincinnati) |
| 1883.03.05 | Apostolic Vicariate of Idaho and Montana was renamed as Apostolic Vicariate of Idaho |
| 1884.03.07 | Apostolic Vicariate of Montana was promoted as Diocese of Helena (became suffragan of Oregon City) |
| 1884.04.15 | Diocese of Manchester was established (from Diocese of Portland in Maine and became suffragan of Boston) |
| 1885.10.02 | Apostolic Vicariate of Nebraska was promoted as Diocese of Omaha (became suffragan of Saint Louis) |
| 1886.05.28 | Diocese of Grass Valley was suppressed (to establish Diocese of Sacramento) |
| 1886.05.28 | Diocese of Sacramento was established (from Metropolitan Archdiocese of San Francisco, from the suppressed Diocese of Grass Valley and became suffragan of San Francisco) |
| 1886.11.23 | Apostolic Vicariate of Utah was established (from Metropolitan Archdiocese of San Francisco and became suffragan of San Francisco) |
| 1886.11.26 | Diocese of Syracuse was established (from Diocese of Albany and became suffragan of New York) |
| 1887.01.07 | Diocese of Belleville was established (from Diocese of Alton and became suffragan of Chicago) |
| 1887.08.02 | Diocese of Cheyenne was established (from Diocese of Omaha and became suffragan of Saint Louis) |
| 1887.08.02 | Diocese of Concordia was established (from Diocese of Leavenworth and became suffragan of Saint Louis) |
| 1887.08.02 | Diocese of Lincoln was established (from Diocese of Omaha and became suffragan of Saint Louis) |
| 1887.08.02 | Diocese of Wichita was established (from Diocese of Leavenworth and became suffragan of Saint Louis) |
| 1887.08.16 | Apostolic Vicariate of Colorado was promoted as Diocese of Denver (became suffragan of Santa Fe) |
| 1888.03.05 | Apostolic Vicariate of Idaho lost territory to Diocese of Helena |
| 1888.05.04 | Diocese of Saint Paul was promoted as Metropolitan Archdiocese of Saint Paul (with suffragan see Dakota) |
| 1889.07.01 | Diocese of Allegheny was suppressed (to Diocese of Pittsburgh) |
| 1889.09.22 | Apostolic Vicariate of Northern Minnesota was promoted as Diocese of Saint Cloud (became suffragan of Saint Paul) |
| 1889.10.03 | Diocese of Duluth was established (from Diocese of Saint Cloud and became suffragan of Saint Paul) |
| 1889.11.10 | Diocese of Jamestown was established (from Apostolic Vicariate of Dakota and became suffragan of Saint Paul) |
| 1889.11.12 | Apostolic Vicariate of Dakota was promoted as Diocese of Sioux Falls |
| 1889.11.26 | Diocese of Winona was established (from Metropolitan Archdiocese of Saint Paul and became suffragan of Saint Paul) |
| 1890.07.15 | Diocese of Dallas was established (from Diocese of Galveston and became suffragan of New Orleans) |
| 1891 | Apostolic Vicariate of Arizona lost territory to Diocese of Dallas |
| 1891.01.27 | Apostolic Vicariate of Utah was promoted as Diocese of Salt Lake |
| 1891.05.29 | Apostolic Prefecture of Indian Territory was promoted as Apostolic Vicariate of Indian Territory |
| 1891.05.29 | Diocese of Leavenworth was renamed as Diocese of Kansas City, Kansas |
| 1893.06.15 | Diocese of Dubuque was promoted as Metropolitan Archdiocese of Dubuque (with suffragan sees Davenport, Lincoln and Omaha) |
| 1893.08.25 | Apostolic Vicariate of Idaho was promoted as Diocese of Boise City (became suffragan of Oregon City) |
| 1894.07.27 | Apostolic Prefecture of Alaska was established (from Diocese of New Westminster and Diocese of Vancouver Island) |
| 1897.03.05 | Diocese of Kansas City, Kansas was renamed as Diocese of Leavenworth |
| 1897.04.06 | Diocese of Fargo was established (from the suppressed Diocese of Jamestown and became suffragan of Saint Paul) |
| 1897.04.06 | Diocese of Jamestown was suppressed (to establish Diocese of Fargo) |
| 1897.05.08 | Apostolic Vicariate of Arizona was promoted as Diocese of Tucson (became suffragan of Santa Fe) |
| 1898.03.28 | Diocese of Indianapolis was established (from the suppressed Diocese of Vincennes and became suffragan of Cincinnati) |
| 1898.03.28 | Diocese of Vincennes was suppressed (to establish Diocese of Indianapolis) |
| 1901.05.30 | Diocese of Altoona was established (from Diocese of Harrisburg and Diocese of Pittsburgh and became suffragan of Philadelphia) |
| 1902.01.15 | Diocese of Sioux City was established (from Metropolitan Archdiocese of Dubuque and became suffragan of Dubuque) |
| 1902.08.04 | Diocese of Lead was established (from Diocese of Sioux Falls and became suffragan of Saint Paul) |
| 1903.06.19 | Diocese of Baker City was established (from Metropolitan Archdiocese of Oregon City and became suffragan of Oregon City) |
| 1904.03.12 | Diocese of Fall River was established (from Diocese of Providence and became suffragan of Boston) |
| 1904.05.18 | Diocese of Great Falls was established (from Diocese of Helena and became suffragan of Oregon City) |
| 1905.05.03 | Diocese of Superior was established (from Diocese of Green Bay and Diocese of La Crosse and became suffragan of Milwaukee) |
| 1905.08.23 | Apostolic Vicariate of Indian Territory was promoted as Diocese of Oklahoma (became suffragan of New Orleans) |
| 1907.09.11 | Diocese of Nesqually was suppressed (to establish Diocese of Seattle) |
| 1907.09.11 | Diocese of Seattle was established (from the suppressed Diocese of Nesqually and became suffragan of Oregon City) |
| 1908.09.23 | Diocese of Rockford was established (from Metropolitan Archdiocese of Chicago and became suffragan of Chicago) |
| 1909.12.31 | Diocese of Bismarck was established (from Diocese of Fargo and became suffragan of Saint Paul) |
| 1909.12.31 | Diocese of Crookston was established (from Metropolitan Archdiocese of Saint Paul and became suffragan of Saint Paul) |
| 1910.04.15 | Diocese of Toledo was established (from Diocese of Cleveland and became suffragan of Cincinnati) |
| 1910.06.08 | Abbacy nullius of Belmont–Mary Help of Christians was established (from Apostolic Vicariate of North Carolina and became suffragan of Baltimore) |
| 1910.08.06 | Diocese of Alexandria was established (from the suppressed Diocese of Natchitoches and became suffragan of New Orleans) |
| 1910.08.06 | Diocese of Natchitoches was suppressed (to establish Diocese of Alexandria) |
| 1911.08.12 | Diocese of Des Moines was established (from Diocese of Davenport and became suffragan of Dubuque) |
| 1912.03.08 | Diocese of Kearney was established (from Diocese of Omaha and became suffragan of Dubuque) |
| 1912.03.23 | Apostolic Vicariate of Brownsville was suppressed (to establish Diocese of Corpus Christi) |
| 1912.03.23 | Diocese of Corpus Christi was established (from the suppressed Apostolic Vicariate of Brownsville and became suffragan of New Orleans) |
| 1913.05.28 | Ordinariate of United States of America (Ukrainian Rite) was established |
| 1913.12.17 | Diocese of Spokane was established (from Diocese of Seattle and became suffragan of Oregon City) |
| 1914.03.03 | Diocese of El Paso was established (from Diocese of Dallas, Diocese of San Antonio and Diocese of Tucson and became suffragan of New Orleans) |
| 1917.02.15 | Apostolic Prefecture of Alaska was promoted as Apostolic Vicariate of Alaska |
| 1917.04.11 | Diocese of Grand Island was established (from the suppressed Diocese of Kearney and became suffragan of Dubuque) |
| 1917.04.11 | Diocese of Kearney was suppressed (to establish Diocese of Grand Island) |
| 1918.01.11 | Diocese of Lafayette in Louisiana was established (from Metropolitan Archdiocese of New Orleans and became suffragan of New Orleans) |
| 1922.06.01 | Diocese of Los Angeles–San Diego was established (from Diocese of Monterey–Los Angeles and became suffragan of San Francisco) |
| 1922.06.01 | Diocese of Monterey–Los Angeles was renamed as Diocese of Monterey–Fresno (lost territory to establish Diocese of Los Angeles–San Diego) |
| 1923.10.26 | Diocese of Alton was suppressed (to establish Diocese of Springfield in Illinois) |
| 1923.10.26 | Diocese of Springfield in Illinois was established (from the suppressed Diocese of Alton and became suffragan of Chicago) |
| 1924.05.08 | Apostolic Exarchate of United States of America (Ruthenian Rite) was established (from Ordinariate of United States of America) |
| 1924.05.08 | Ordinariate of United States of America (Ukrainian Rite) was promoted as Apostolic Exarchate of United States of America (lost territory to establish Apostolic Exarchate of United States of America) |
| 1924.12.12 | Apostolic Vicariate of North Carolina was promoted as Diocese of Raleigh (became suffragan of Baltimore) |
| 1926.08.03 | Diocese of Amarillo was established (from Diocese of Dallas and Diocese of San Antonio and became suffragan of San Antonio) |
| 1926.08.03 | Diocese of San Antonio was promoted as Metropolitan Archdiocese of San Antonio (with suffragan sees Amarillo, Corpus Christi, Dallas, El Paso and Galveston and lost territory to establish Diocese of Amarillo) |
| 1928.09.26 | Metropolitan Archdiocese of Oregon City was suppressed (to establish Metropolitan Archdiocese of Portland in Oregon) |
| 1928.09.26 | Metropolitan Archdiocese of Portland in Oregon was established (from the suppressed Metropolitan Archdiocese of Oregon City and with suffragan sees Baker City, Boise City, Great Falls, Helena, Seattle and Spokane) |
| 1930.08.01 | Diocese of Lead was suppressed (to establish Diocese of Rapid City) |
| 1930.08.01 | Diocese of Rapid City was established (from the suppressed Diocese of Lead and became suffragan of Saint Paul) |
| 1930.11.14 | Diocese of Oklahoma was renamed as Diocese of Oklahoma City–Tulsa |
| 1931.03.27 | Diocese of Reno was established (from Diocese of Sacramento and Diocese of Salt Lake and became suffragan of San Francisco) |
| 1936.07.11 | Diocese of Los Angeles–San Diego was promoted as Metropolitan Archdiocese of Los Angeles (with suffragan sees Monterey–Fresno and San Diego and lost territory to establish Diocese of San Diego) |
| 1936.07.11 | Diocese of San Diego was established (from Diocese of Los Angeles–San Diego and became suffragan of Los Angeles) |
| 1937.01.03 | Diocese of Marquette was established (from the suppressed Diocese of Sault Sainte Marie–Marquette and became suffragan of Milwaukee) |
| 1937.01.03 | Diocese of Sault Sainte Marie–Marquette was suppressed (to establish Diocese of Marquette) |
| 1937.01.05 | Diocese of Savannah was renamed as Diocese of Savannah–Atlanta |
| 1937.05.22 | Diocese of Detroit was promoted as Metropolitan Archdiocese of Detroit (with suffragan sees Grand Rapids, Lansing and Marquette and lost territory to establish Diocese of Lansing) |
| 1937.05.22 | Diocese of Lansing was established (from Diocese of Detroit and became suffragan of Detroit) |
| 1937.12.09 | Diocese of Camden was established (from Diocese of Trenton) |
| 1937.12.09 | Diocese of Owensboro was established (from Diocese of Louisville) |
| 1937.12.09 | Diocese of Paterson was established (from Diocese of Newark) |
| 1937.12.10 | Diocese of Louisville was promoted as Metropolitan Archdiocese of Louisville (with suffragan sees Covington, Nashville and Owensboro) |
| 1937.12.10 | Diocese of Newark was promoted as Metropolitan Archdiocese of Newark (with suffragan sees Camden, Paterson and Trenton) |
| 1938.02.26 | Diocese of Saginaw was established (from Metropolitan Archdiocese of Detroit and Diocese of Grand Rapids and became suffragan of Detroit) |
| 1939.07.22 | Metropolitan Archdiocese of Baltimore was renamed as Metropolitan Archdiocese of Baltimore–Washington |
| 1939.12.16 | Diocese of Gallup was established (from Metropolitan Archdiocese of Santa Fe and Diocese of Tucson and became suffragan of Santa Fe) |
| 1941.01.25 | Apostolic Vicariate of Hawaiian Islands was promoted as Diocese of Honolulu (became suffragan of San Francisco) |
| 1941.11.15 | Diocese of Denver was promoted as Metropolitan Archdiocese of Denver (with suffragan sees Cheyenne and Pueblo and lost territory to establish Diocese of Pueblo) |
| 1941.11.15 | Diocese of Pueblo was established (from Diocese of Denver and became suffragan of Denver) |
| 1943.05.15 | Diocese of Youngstown was established (from Diocese of Cleveland and became suffragan of Cincinnati) |
| 1944.04.17 | Abbacy nullius of Belmont–Mary Help of Christians lost territory to Diocese of Raleigh |
| 1944.10.21 | Diocese of Evansville was established (from Diocese of Indianapolis and became suffragan of Indianapolis) |
| 1944.10.21 | Diocese of Indianapolis was promoted as Metropolitan Archdiocese of Indianapolis (with suffragan sees Evansville, Fort Wayne and Lafayette in Indiana and lost territory to establish Diocese of Evansville) |
| 1944.10.21 | Diocese of Lafayette in Indiana was established (from Diocese of Fort Wayne and became suffragan of Indianapolis) |
| 1944.10.21 | Diocese of Steubenville was established (from Diocese of Columbus and became suffragan of Cincinnati) |
| 1944.12.23 | Diocese of Concordia was suppressed (to establish Diocese of Salina) |
| 1944.12.23 | Diocese of Salina was established (from the suppressed Diocese of Concordia and became suffragan of Saint Louis) |
| 1945.08.04 | Diocese of Omaha was promoted as Metropolitan Archdiocese of Omaha (with suffragan sees Grand Island and Lincoln) |
| 1945.12.22 | Diocese of Madison was established (from Metropolitan Archdiocese of Milwaukee, Diocese of Green Bay and Diocese of La Crosse and became suffragan of Milwaukee) |
| 1947.05.10 | Diocese of Kansas City was established (from the suppressed Diocese of Leavenworth and became suffragan of Saint Louis) |
| 1947.05.10 | Diocese of Leavenworth was suppressed (to establish Diocese of Kansas City) |
| 1947.11.15 | Diocese of Austin was established (from Metropolitan Archdiocese of San Antonio, Diocese of Dallas and Diocese of Galveston and became suffragan of San Antonio) |
| 1947.11.15 | Metropolitan Archdiocese of Baltimore–Washington was renamed as Metropolitan Archdiocese of Baltimore (lost territory to establish Archdiocese of Washington and gained suffragan see Washington) |
| 1947.11.15 | Archdiocese of Washington was established (from Metropolitan Archdiocese of Baltimore–Washington and became suffragan of Baltimore) |
| 1948.12.11 | Diocese of Joliet was established (from Metropolitan Archdiocese of Chicago, Diocese of Peoria and Diocese of Rockford and became suffragan of Chicago) |
| 1950.01.14 | Diocese of Worcester was established (from Diocese of Springfield in Massachusetts and became suffragan of Boston) |
| 1951.03.10 | Diocese of Greensburg was established (from Diocese of Pittsburgh and became suffragan of Philadelphia) |
| 1951.03.31 | Diocese of Salt Lake was renamed as Diocese of Salt Lake City |
| 1951.05.19 | Diocese of Dodge City was established (from Diocese of Wichita and became suffragan of Saint Louis) |
| 1951.06.23 | Diocese of Juneau was established (from Apostolic Vicariate of Alaska) |
| 1951.06.23 | Diocese of Seattle was promoted as Metropolitan Archdiocese of Seattle (with suffragan sees Spokane and Yakima and lost territory to establish Diocese of Yakima) |
| 1951.06.23 | Diocese of Yakima was established (from Diocese of Seattle and Diocese of Spokane and became suffragan of Seattle) |
| 1952.02.16 | Diocese of Baker City was renamed as Diocese of Baker |
| 1952.08.09 | Diocese of Kansas City was promoted as Metropolitan Archdiocese of Kansas City (with suffragan sees Dodge City, Salina and Wichita) |
| 1953.08.06 | Diocese of Bridgeport was established (from Diocese of Hartford and became suffragan of Hartford) |
| 1953.08.06 | Diocese of Hartford was promoted as Metropolitan Archdiocese of Hartford (with suffragan sees Bridgeport, Norwich and Providence and lost territory to establish Diocese of Bridgeport and Diocese of Norwich) |
| 1953.08.06 | Diocese of Norwich was established (from Diocese of Hartford and became suffragan of Hartford) |
| 1953.10.20 | Diocese of Dallas was renamed as Diocese of Dallas–Fort Worth |
| 1954.04.30 | Diocese of Mobile was renamed as Diocese of Mobile–Birmingham |
| 1956.07.02 | Diocese of Atlanta was established (from Diocese of Savannah–Atlanta and became suffragan of Baltimore) |
| 1956.07.02 | Diocese of Jefferson City was established (from Metropolitan Archdiocese of Saint Louis and Diocese of Kansas City, from the suppressed Diocese of Saint Joseph and became suffragan of Saint Louis) |
| 1956.07.02 | Diocese of Kansas City was renamed as Diocese of Kansas City–Saint Joseph (gained territory from the suppressed Diocese of Saint Joseph and lost territory to establish Diocese of Jefferson City and Diocese of Springfield–Cape Girardeau) |
| 1956.07.02 | Diocese of Saint Joseph was suppressed (to Diocese of Kansas City–Saint Joseph and to establish Diocese of Jefferson City and Diocese of Springfield–Cape Girardeau) |
| 1956.07.02 | Diocese of Savannah–Atlanta was renamed as Diocese of Savannah (lost territory to establish Diocese of Atlanta) |
| 1956.07.02 | Diocese of Springfield–Cape Girardeau was established (from Metropolitan Archdiocese of Saint Louis and Diocese of Kansas City, from the suppressed Diocese of Saint Joseph and became suffragan of Saint Louis) |
| 1956.07.20 | Apostolic Exarchate of Stamford (Ukrainian Rite) was established (from Apostolic Exarchate of United States of America) |
| 1956.12.10 | Diocese of Gary was established (from Diocese of Fort Wayne and became suffragan of Indianapolis) |
| 1956.12.18 | Diocese of Natchez was renamed as Diocese of Natchez–Jackson |
| 1957.04.06 | Diocese of Rockville Centre was established (from Diocese of Brooklyn and became suffragan of New York) |
| 1957.09.08 | Military Vicariate of United States of America was established |
| 1957.10.09 | Diocese of Altoona was renamed as Diocese of Altoona–Johnstown |
| 1957.11.18 | Diocese of New Ulm was established (from Metropolitan Archdiocese of Saint Paul and became suffragan of Saint Paul) |
| 1958.05.25 | Diocese of Miami was established (from Diocese of Saint Augustine and became suffragan of Baltimore) |
| 1958.07.10 | Apostolic Exarchate of United States of America (Ukrainian Rite) was promoted as Metropolitan Archdiocese of Philadelphia (with suffragan see Stamford) |
| 1958.07.10 | Apostolic Exarchate of Stamford (Ukrainian Rite) was promoted as Diocese of Stamford (became suffragan of Philadelphia) |
| 1959.07.25 | Diocese of Galveston was renamed as Diocese of Galveston–Houston |
| 1960.03.26 | Abbacy nullius of Belmont–Mary Help of Christians lost territory to Diocese of Raleigh |
| 1960.05.28 | Diocese of Fort Wayne was renamed as Diocese of Fort Wayne–South Bend |
| 1961.01.28 | Diocese of Allentown was established (from Metropolitan Archdiocese of Philadelphia and became suffragan of Philadelphia) |
| 1961.07.14 | Diocese of Saint Nicholas of Chicago (Ukrainian Rite) was established (from Metropolitan Archdiocese of Philadelphia and became suffragan of Philadelphia) |
| 1961.07.22 | Diocese of Baton Rouge was established (from Metropolitan Archdiocese of New Orleans and became suffragan of New Orleans) |
| 1961.10.16 | Diocese of San Angelo was established (from Diocese of Amarillo, Diocese of Austin and Diocese of Dallas–Fort Worth and became suffragan of San Antonio) |
| 1962.01.13 | Diocese of Oakland was established (from Metropolitan Archdiocese of San Francisco and became suffragan of San Francisco) |
| 1962.01.13 | Diocese of Santa Rosa was established (from Metropolitan Archdiocese of San Francisco and Diocese of Sacramento and became suffragan of San Francisco) |
| 1962.01.13 | Diocese of Stockton was established (from Metropolitan Archdiocese of San Francisco and Diocese of Sacramento and became suffragan of San Francisco) |
| 1962.02.10 | Diocese of Atlanta was promoted as Metropolitan Archdiocese of Atlanta (with suffragan sees Charleston, Miami, Raleigh, Saint Augustine and Savannah) |
| 1962.08.08 | Apostolic Vicariate of Alaska was promoted as Diocese of Fairbanks (without ecclesiastical province) |
| 1963.07.06 | Diocese of Passaic (Ruthenian Rite) was established (from Apostolic Exarchate of United States of America) |
| 1963.07.06 | Apostolic Exarchate of United States of America (Ruthenian Rite) was promoted as Diocese of Pittsburgh (lost territory to establish Diocese of Passaic) |
| 1965.07.10 | Diocese of Brownsville was restored (from Diocese of Corpus Christi and became suffragan of San Antonio) |
| 1965.10.12 | Archdiocese of Washington was promoted as Metropolitan Archdiocese of Washington (with suffragan see Virgin Islands) |
| 1966.01.10 | Apostolic Exarchate of United States of America (Maronite Rite) was established |
| 1966.01.10 | Apostolic Exarchate of United States of America (Greek-Melkite Rite) was established |
| 1966.01.22 | Metropolitan Archdiocese of Anchorage was established (from Diocese of Juneau and with suffragan sees Fairbanks and Juneau) |
| 1966.06.25 | Diocese of Beaumont was established (from Diocese of Galveston–Houston and became suffragan of San Antonio) |
| 1966.07.11 | Metropolitan Archdiocese of Saint Paul was renamed as Metropolitan Archdiocese of Saint Paul and Minneapolis |
| 1966.09.15 | Diocese of Sacramento lost territory to Diocese of Stockton |
| 1967.10.06 | Diocese of Fresno was established (from Diocese of Monterey–Fresno and became suffragan of Los Angeles) |
| 1967.10.06 | Diocese of Monterey–Fresno was renamed as Diocese of Monterey (lost territory to establish Diocese of Fresno) |
| 1968.03.02 | Diocese of Miami was promoted as Metropolitan Archdiocese of Miami (with suffragan sees Orlando, Saint Augustine and Saint Petersburg and lost territory to establish Diocese of Orlando and Diocese of Saint Petersburg) |
| 1968.03.02 | Diocese of Mobile–Birmingham lost territory to Diocese of Saint Augustine |
| 1968.03.02 | Diocese of Orlando was established (from Diocese of Miami and Diocese of Saint Augustine and became suffragan of Miami) |
| 1968.03.02 | Diocese of Saint Petersburg was established (from Diocese of Miami and Diocese of Saint Augustine and became suffragan of Miami) |
| 1969.02.21 | Diocese of Pittsburgh (Ruthenian Rite) was promoted as Metropolitanate sui juris of Munhall (with suffragan sees Parma and Passaic and lost territory to establish Diocese of Parma) |
| 1969.02.21 | Diocese of Parma (Ruthenian Rite) was established (from Diocese of Pittsburgh and became suffragan of Munhall) |
| 1969.06.28 | Diocese of Birmingham was established (from Diocese of Mobile–Birmingham and became suffragan of New Orleans) |
| 1969.06.28 | Diocese of Mobile–Birmingham was renamed as Diocese of Mobile (lost territory to establish Diocese of Birmingham) |
| 1969.06.28 | Diocese of Phoenix was established (from Diocese of Tucson and became suffragan of Santa Fe) |
| 1969.08.09 | Diocese of Dallas–Fort Worth was renamed as Diocese of Dallas (lost territory to establish Diocese of Fort Worth) |
| 1969.08.09 | Diocese of Fort Worth was established (from Diocese of Dallas–Fort Worth and became suffragan of San Antonio) |
| 1970.06.20 | Diocese of Memphis was established (from Diocese of Nashville and became suffragan of Louisville) |
| 1970.12.19 | Diocese of Gaylord was established (from Diocese of Grand Rapids and Diocese of Saginaw and became suffragan of Detroit) |
| 1970.12.19 | Diocese of Kalamazoo was established (from Diocese of Grand Rapids and Diocese of Lansing and became suffragan of Detroit) |
| 1971 | Titular Episcopal See of Allegheny was restored |
| 1971 | Titular Episcopal See of Walla Walla was restored |
| 1971.11.12 | Diocese of Charlotte was established (from Diocese of Raleigh and became suffragan of Atlanta) |
| 1971.11.29 | Apostolic Exarchate of United States of America (Maronite Rite) was promoted as Diocese of Saint Maron of Detroit (without ecclesiastical province) |
| 1972.12.13 | Diocese of Oklahoma City–Tulsa was promoted as Metropolitan Archdiocese of Oklahoma City (with suffragan sees Little Rock and Tulsa and lost territory to establish Diocese of Tulsa) |
| 1972.12.13 | Diocese of Tulsa was established (from Diocese of Oklahoma City–Tulsa and became suffragan of Oklahoma City) |
| 1974.05.28 | Diocese of Arlington was established (from Metropolitan Archdiocese of Washington and Diocese of Richmond and became suffragan of Baltimore) |
| 1974.08.21 | Diocese of Wheeling was renamed as Diocese of Wheeling–Charleston |
| 1975.10.01 | Diocese of Pensacola–Tallahassee was established (from Diocese of Saint Augustine and became suffragan of Miami) |
| 1976.03.24 | Diocese of Orange was established (from Metropolitan Archdiocese of Los Angeles and became suffragan of Los Angeles) |
| 1976.06.28 | Apostolic Exarchate of United States of America (Greek-Melkite Rite) was promoted as Diocese of Newton (without ecclesiastical province) |
| 1976.10.13 | Diocese of Reno was renamed as Diocese of Reno–Las Vegas |
| 1976.10.18 | Diocese of Alexandria was renamed as Diocese of Alexandria–Shreveport |
| 1977.01.01 | Abbacy nullius of Belmont–Mary Help of Christians was suppressed (to Diocese of Charlotte) |
| 1977.03.01 | Diocese of Biloxi was established (from the suppressed Diocese of Natchez–Jackson and became suffragan of New Orleans) |
| 1977.03.01 | Diocese of Jackson was established (from the suppressed Diocese of Natchez–Jackson and became suffragan of New Orleans) |
| 1977.03.01 | Diocese of Natchez–Jackson was suppressed (to establish Diocese of Biloxi and Diocese of Jackson) |
| 1977.03.02 | Diocese of Houma–Thibodaux was established (from Metropolitan Archdiocese of New Orleans and became suffragan of New Orleans) |
| 1977.03.11 | Metropolitanate sui juris of Munhall (Ruthenian Rite) was renamed as Metropolitanate sui juris of Pittsburgh |
| 1977.06.27 | Diocese of Saint Maron of Detroit (Maronite Rite) was renamed as Diocese of Saint Maron of Brooklyn |
| 1978.07.14 | Diocese of San Bernardino was established (from Diocese of San Diego and became suffragan of Los Angeles) |
| 1980.01.29 | Diocese of Lake Charles was established (from Diocese of Lafayette in Louisiana and became suffragan of New Orleans) |
| 1980.02.14 | Diocese of Great Falls was renamed as Diocese of Great Falls–Billings |
| 1980.07.29 | Diocese of Mobile was promoted as Metropolitan Archdiocese of Mobile (with suffragan sees Biloxi, Birmingham and Jackson) |
| 1981.01.27 | Diocese of San Jose was established (from Metropolitan Archdiocese of San Francisco and became suffragan of San Francisco) |
| 1981.07.03 | Apostolic Exarchate of United States of America and Canada (Armenian Rite) was established |
| 1981.11.19 | Diocese of Metuchen was established (from Diocese of Trenton and became suffragan of Newark) |
| 1981.12.03 | Diocese of Van Nuys (Ruthenian Rite) was established (from Diocese of Parma and became suffragan of Pittsburgh) |
| 1982.01.11 | Apostolic Exarchate of United States of America (Chaldean Rite) was established |
| 1982.01.11 | Apostolic Exarchate of United States of America (Romanian Rite) was established |
| 1982.04.13 | Diocese of Victoria was established (from Metropolitan Archdiocese of San Antonio, Diocese of Corpus Christi and Diocese of Galveston–Houston and became suffragan of San Antonio) |
| 1982.08.17 | Diocese of Las Cruces was established (from Metropolitan Archdiocese of Santa Fe and Diocese of El Paso and became suffragan of Santa Fe) |
| 1983.03.25 | Diocese of Lubbock was established (from Diocese of Amarillo and Diocese of San Angelo and became suffragan of San Antonio) |
| 1983.11.10 | Diocese of Colorado Springs was established (from Metropolitan Archdiocese of Denver and Diocese of Pueblo and became suffragan of Denver) |
| 1983.12.05 | Diocese of Saint Josaphat in Parma (Ukrainian Rite) was established (from Metropolitan Archdiocese of Philadelphia and became suffragan of Philadelphia) |
| 1984.06.16 | Diocese of Palm Beach was established (from Metropolitan Archdiocese of Miami and Diocese of Orlando and became suffragan of Miami) |
| 1984.06.16 | Diocese of Venice was established (from Metropolitan Archdiocese of Miami, Diocese of Orlando and Diocese of Saint Petersburg and became suffragan of Miami) |
| 1985.08.03 | Apostolic Exarchate of United States of America (Chaldean Rite) was promoted as Diocese of Saint Thomas the Apostle of Detroit (without ecclesiastical province) |
| 1986.06.16 | Diocese of Alexandria–Shreveport was renamed as Diocese of Alexandria (lost territory to establish Diocese of Shreveport) |
| 1986.06.16 | Diocese of Shreveport was established (from Diocese of Alexandria–Shreveport and became suffragan of New Orleans) |
| 1986.07.21 | Military Vicariate of United States of America was promoted as Military Ordinariate of Archdiocese for the Military Services of the United States |
| 1986.12.12 | Diocese of Tyler was established (from Diocese of Beaumont, Diocese of Dallas and Diocese of Galveston–Houston and became suffragan of San Antonio) |
| 1987.03.26 | Apostolic Exarchate of United States of America (Romanian Rite) was promoted as Diocese of Saint George’s in Canton (without ecclesiastical province) |
| 1988.01.14 | Diocese of Lexington was established (from Metropolitan Archdiocese of Louisville and Diocese of Covington and became suffragan of Louisville) |
| 1988.05.27 | Diocese of Knoxville was established (from Diocese of Nashville and became suffragan of Louisville) |
| 1989.12 | Diocese of Austin lost territory to Diocese of Victoria |
| 1994.02.19 | Diocese of Our Lady of Lebanon of Los Angeles (Maronite Rite) was established (from Diocese of Saint Maron of Brooklyn and without ecclesiastical province) |
| 1995 | Titular Episcopal See of Alton was restored |
| 1995 | Titular Episcopal See of Bardstown was restored |
| 1995 | Titular Episcopal See of Concordia was restored |
| 1995 | Titular Episcopal See of Grass Valley was restored |
| 1995 | Titular Episcopal See of Jamestown was restored |
| 1995 | Titular Episcopal See of Kearney was restored |
| 1995 | Titular Episcopal See of Lead was restored |
| 1995 | Titular Episcopal See of Leavenworth was restored |
| 1995 | Titular Episcopal See of Natchitoches was restored |
| 1995 | Titular Episcopal See of Nesqually was restored |
| 1995 | Titular Episcopal See of Quincy was restored |
| 1995 | Titular Episcopal See of Sault Sainte Marie was restored |
| 1995 | Titular Episcopal See of Vincennes was restored |
| 1995.03.21 | Diocese of Las Vegas was established (from Diocese of Reno–Las Vegas and became suffragan of San Francisco) |
| 1995.03.21 | Diocese of Reno–Las Vegas was renamed as Diocese of Reno (lost territory to establish Diocese of Las Vegas) |
| 1995.11.06 | Diocese of Our Lady of Deliverance of Newark (Syriac Rite) was established (without ecclesiastical province) |
| 1996 | Titular Episcopal See of California was restored |
| 1996 | Titular Metropolitan See of Oregon City was restored |
| 1996 | Titular Episcopal See of Sault Sainte Marie was renamed as Titular Episcopal See of Sault Sainte Marie in Michigan |
| 2000.07.03 | Diocese of Laredo was established (from Metropolitan Archdiocese of San Antonio and Diocese of Corpus Christi and became suffragan of San Antonio) |
| 2001.02.16 | Diocese of Saint Thomas the Apostle of Chicago (Syro-Malabar Rite) was established (without ecclesiastical province) |
| 2002.05.21 | Diocese of Saint Peter the Apostle of San Diego (Chaldean Rite) was established (from Diocese of Saint Thomas the Apostle of Detroit and without ecclesiastical province) |
| 2004.12.29 | Diocese of Galveston–Houston was promoted as Metropolitan Archdiocese of Galveston–Houston (with suffragan sees Austin, Beaumont, Brownsville, Corpus Christi, Tyler and Victoria) |
| 2005.09.12 | Apostolic Exarchate of United States of America and Canada (Armenian Rite) was promoted as Diocese of Our Lady of Nareg in New York (without ecclesiastical province) |
| 2009.12.18 | Diocese of Van Nuys (Ruthenian Rite) was renamed as Diocese of Holy Protection of Mary of Phoenix |
| 2010.07.14 | Apostolic Exarchate of United States of America (Syro-Malankara Rite) was established |
| 2012.01.01 | Personal Ordinariate of The Chair of Saint Peter (Anglican Rite) was established |
| 2014.12.29 | Diocese of Our Lady of Nareg in New York (Armenian Rite) was renamed as Diocese of Our Lady of Nareg in Glendale |
| 2015.12.22 | Apostolic Exarchate of United States of America (Syro-Malankara Rite) was promoted as Diocese of Saint Mary, Queen of Peace, of the United States of America and Canada (gained territory of Canada and without ecclesiastical province) |
| 2018.01.23 | Diocese of Winona was renamed as Diocese of Winona–Rochester |
| 2018.05.20 | Diocese of Fargo lost territory to Diocese of Bismarck |
| 2020.05.19 | Metropolitan Archdiocese of Anchorage was renamed as Metropolitan Archdiocese of Anchorage–Juneau (gained territory from the suppressed Diocese of Juneau and lost suffragan see Juneau) |
| 2020.05.19 | Diocese of Juneau was suppressed (to Metropolitan Archdiocese of Anchorage–Juneau) |
| 2021.06.28 | Diocese of Our Lady of Deliverance of Newark (Syriac Rite) was renamed as Diocese of Our Lady of Deliverance in the United States |
| 2023.05.30 | Diocese of Las Vegas was promoted as Metropolitan Archdiocese of Las Vegas (with suffragan sees Reno and Salt Lake City) |
Last updated on 2024.12.24
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