The organizational structure of the Catholic Church in the United States consists of 33 Provinces with as many Archdioceses (Metropolitan Sees); 148 Suffragan Sees (Dioceses); The Military Archdiocese; four Eastern-Rite jurisdictions immediately subject to the Holy See in Rome. The Eparchies of St. Maron (Marionites), Newton (Melkites), St. Thomas the Apostle of Detroit (Chaldeans) and St. George Martyr of Canton, Ohio (Romanians). Each of these jurisdictions is under the direction of an Archbishop and Bishop called an Ordinary, who has apostolic responsibility and authority for the pastoral service of the people in his care.

The structure includes the territorial Episcopal conference known as the National Conference of Catholic Bishops. In and through this body, which is strictly ecclesiastical and has defined juridical authority, the Bishops exercise their collegiate pastorate over the Church in the entire country.

Related to the NCCB is the United States Catholic Conference, a civil corporation and operational secretariat through which the Bishops, in cooperation with other members of the Church, act on a wider-than-ecclesiastical scale for the good of the Church and society in the United States.

The following is a list of the thirteen regions in the United States and provinces within those regions.

Region I: Includes the states of Maine, Vermont, New Hampshire, Massachusetts, Rhode Island, and Connecticut. Provinces of Boston and Hartford; Eparchy of Stamford and Eparchy for Melkites.

Region II: Includes the state of New York. Province of New York and Eparchy of St. Maron.

Region III: Includes the states of New Jersey and Pennsylvania. Provinces of Newark and Philadelphia; Archeparchy of Philadelphia, Ukrainian Archeparchy of Pittsburgh, Byzantine Eparchy of Passaic, and Apostolic Exarchate for Armenians.

Region IV: Includes the states of Delaware, District of Columbia, Florida, Georgia, Maryland, North Carolina, South Carolina, Virgin Islands, Virginia and West Virginia. Provinces of Atlanta, Baltimore, Miami, Washington, and the Military Archdiocese.

Region V: Includes the states of Alabama, Kentucky, Louisiana, Mississippi and Tennessee. Provinces of Louisville, Mobile and New Orleans.

Region VI: Includes the states of Michigan and Ohio. Provinces of Cincinnati, Detroit; Eparchy of Parma, Apostolic Exarchate for Chaldeans, and Apostolic Exarchate for Romanians.

Region VII: Includes the states of Illinois, Indiana and Wisconsin. Provinces of Chicago, Indianapolis, Milwaukee; Eparchy of St. Nicolas in Chicago-Ukrainian.

Region VIII: Includes the states of Minnesota, North Dakota and South Dakota, Provinces of St. Paul and Minneapolis.

Region IX: Includes the states of Kansas, Missouri and Nebraska. Provinces of Dubuque, Kansas City in Kansas, Omaha and St. Louis.

Region X: Includes the states of Arkansas, Oklahoma and Texas (excluding El Paso). Provinces of Oklahoma City and San Antonio.

Region XI: Includes the states of California, Hawaii and Nevada. Provinces of Los Angeles and San Francisco (excluding Salt Lake City); Eparchy of Van Nuys.

Region XII: Includes the states of Alaska, Idaho, Montana, Oregon and Washington. Provinces of Anchorage, Portland and Seattle.

Region XIII: Includes the states of Utah, Arizona, New Mexico, Colorado and Wyoming. Provinces of Denver, Santa FE, part of San Francisco, Salt Lake City, and El Paso.