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In the Orthodox Church in America (OCA), the Diocese is the basic church body that comprises all the parishes of a determined geographical area. It is governed by the Diocesan Bishop, with the assistance of a Diocesan Assembly and a Diocesan Council. The OCA is currently composed of twelve geographic and three ethnic dioceses. The boundaries of the ethnic dioceses overlap those of certain geographic ones. These dioceses are the result of smaller ethnic jurisdictions joining the OCA at some point in its history, usually after having broken from other bodies.
The Stavropegial Institutions are churches, monastic communities, and theological schools that are under the jurisdiction of the OCA's primate (currently Metropolitan Herman (Swaiko)).

Diocese	Bishop	Territory	Chancery
'Diocese of Alaska (OCA-AK)'	The Right Reverend Nikolai (Soraich)	Alaska	Anchorage, AK
'Albanian Archdiocese (OCA-AL)'	The Right Reverend Nikon (Liolin)	California, Connecticut, Massachusetts, Michigan, New York, Ohio, Pennsylvania	South Boston, MA
'Bulgarian Diocese (OCA-BU)'	The Most Blessed Herman (Swaiko)	California, Illinois, Indiana, Kansas, Michigan, Ohio, Ontario, Washington, D.C.	Toledo, OH
'Archdiocese of Canada (OCA-CA)'	The Right Reverend Seraphim (Storheim)	Alberta, British Columbia, Manitoba, Ontario, Quebec, Saskatchewan	Spencerville, Ontario
'Diocese of Eastern Pennsylvania (OCA-EP)'	The Right Reverend Tikhon (Mollard)	Delaware, Pennsylvania	South Canaan, PA
'Exarchate of Mexico (OCA-MX)'	The Most Blessed Herman (Swaiko)	Chiapas, Jalisco, Mexico City, Mexico, Veracruz	México D.F.
'Diocese of the Midwest (OCA-MW)'	The Most Reverend Job (Osacky)	Iowa, Illinois, Indiana, Kansas, Michigan, Minnesota, Missouri, North Dakota, Nebraska, Ohio, Wisconsin	Chicago, IL
'Diocese of New England (OCA-NE)'	The Right Reverend Nikon (Liolin)	Connecticut, Massachusetts, Maine, New Hampshire, Rhode Island, Vermont	Southbridge, MA
'Romanian Episcopate (OCA-RO)'	The Most Reverend Nathaniel (Popp)	Alberta, Arizona, British Columbia, California, Colorado, Connecticut, Florida, Georgia, Illinois, Indiana, Massachusetts, Manitoba, Maryland, Michigan, Minnesota, Missouri, New Hampshire, New Mexico, Nevada, New York, Ohio, Ontario, Oregon, Pennsylvania, Quebec, Rhode Island, Saskatchewan, Tennessee, Texas, Virginia, Washington	Jackson, MI
'Diocese of the South (OCA-SO)'	The Most Reverend Dmitri (Royster)	Alabama, Arkansas, Florida, Georgia, Kentucky, Louisiana, Mississippi, North Carolina, New Mexico, Oklahoma, South Carolina, Tennessee, Texas, Virginia	Dallas, TX
'Diocese of Washington and New York (OCA-WA)'	The Most Blessed Herman (Swaiko)	Delaware, Maryland, New Jersey, New Jersey, Virginia, Washington, D.C.	Syosset, NY
'Diocese of the West (OCA-WE)'	The Right Reverend Benjamin (Peterson)	Arizona, California, Colorado, Hawaii, Montana, Nevada, Oregon, Washington	Los Angeles, CA
'Diocese of Western Pennsylvania (OCA-WP)'	The Most Blessed Herman (Swaiko)	Ohio, Pennsylvania, West Virginia	Cranberry Township, PA
'Parishes in Australia (OCA-AU)'	The Most Blessed Herman (Swaiko)	New South Wales, Queensland	Syosset, NY
'Stavropegial Institutions (OCA-ST)'	The Most Blessed Herman (Swaiko)	California, New York, Ontario, Pennsylvania	Syosset, NY

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Sources

Sources

★ OCA listing of dioceses

★ Orthodox Church in America on OrthodoxWiki