Changes in Ecclesiastical Jurisdictions

in USA

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

Last updated on 2024.02.27

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