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Chaldeans And Assyrians In The United States

St. Thomas the Apostle Diocese

The first pioneers of the Chaldeans and Assyrians people arrived in the United States at the end of nineteenth century. They were few in number, but by the mid twentieth century, they were spread all over the country.

As of July 25, 2002 Chaldeans and Assyrians Catholics in the U.S. have two dioceses, one includes the Eastern states and the other includes the Western states. These dioceses are also known as eparchies, which is a term used to refer to dioceses of Eastern rite Catholic Churches.

  1. The first diocese or eparchy was St. Thomas the Apostle and is based in Detroit, Michigan. It covers thirty one states with more than a hundred thousand members in seven parishes, five of which are in the Detroit area, and two of which are in the Chicago area.

  2. The second diocese or eparchy is St. Peter the Apostle of the Chaldeans and is based in San Diego, California. It has seven parishes and three missions in nineteen States. There are six parishes in California and one in Arizona.

 On January 26, 1982, His Holiness John Paul II established an apostolic Exarchate, for the Chaldeans and Assyrians Catholics faithful who are residents of the United States, and he appointed Rev. Ibrahim Ibrahim as the first apostolic exarch on March 7, 1982. On April 18 of that year, Rev. Ibrahim was ordained bishop in Baghdad and was installed as the first bishop of the new Exarchate Pope John Paul II elevated the apostolic Exarchate, of the Chaldeans and  

Apostolic Exarchate, of Chaldeans and Assyrians Catholics of the United States to the rank of eparchy (diocese) on August 3, 1985. The official title of this diocese was “the Chaldean Diocese of St. Thomas the Apostle.” His Excellency Mar Ibrahim Ibrahim resides in Detroit, and the seat of his diocese is Our Lady of Chaldeans Catholic Cathedral.

On May 21, 2002 St. Peter’s Chaldean Catholic Church in El Cajon, California became the seat of the second Chaldean diocese in the United States. It is now called St. Peter’s Cathedral.

The new diocese was established by Pope John II at the request of the bishops of the Chaldean Church and includes the following nineteen states: California, Arizona, Alaska, Colorado, Hawaii, Idaho, Kansas, Montana, Nebraska, Nevada, Oklahoma, New Mexico, North Dakota, South Dakota, Oregon, Texas, Utah, Washington, and Wyoming.

The Holy Father appointed as the first bishop of the newly established diocese a Chaldean priest named Rev. Sarhad Yawsip Jammo; he was ordained a bishop on July 18, 2002 in Troy, Michigan. On July 25, 2002 Bishop Sarhad Yawsip was installed at St. Peter’s Chaldean Catholic Cathedral in San Diego.

The seven parishes of St. Thomas Diocese are:

Our Lady of Chaldeans Cathedral

25585 Berg Road
Southfield, Michigan 48034
Phone (248) 356-5235
Fax (248) 356-5235

Mother of God Church


Sacred Heart Church

310 West Seven Mile Rd
Detroit, Michigan 48203
Phone (313) 368-6214
Fax (313) 891-0132

Sacred Heart Church

Mar Addai Church

24010 Coolidge Highway
Oak Park, Michigan 48237
Phone (248) 547-4648
Fax (248) 399-9089

Mar Addai Church

Saint Joseph Church

2442 Big Beaver Road
Troy, Michigan 48083
Phone (248) 528-3676
Fax (248) 524-1957

St. Joseph Church

Saint Thomas Church

6900 Maple Road
West Bloomfield, Michigan 48322
Phone (248) 788-2460
Fax (248) 788-2153

St. Thomas Church

Saint Ephrem Church

2537 West Bryn Mawr Avenue
Chicago, Illinois 60659
Phone (773) 271-8899
Fax (773) 271-8866


St. Ephrems Church

Mart Maryam Church

2849 West Chase Avenue
Chicago, Illinois 60645
Phone (773) 761-9401
Fax (773) 271-8866


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