
California is home to several Catholic dioceses, including the Roman Catholic Diocese of Sacramento, the Diocese of Orange, and the Diocese of San Diego. The Diocese of Orange, established in 1976, is one of the largest and most diverse faith communities in the United States, with 1.2 to 1.6 million members, 57 parishes, five pastoral centers, and 36 schools. The Diocese of Sacramento serves 20 counties in northern California, while the Diocese of San Diego serves San Diego and Imperial Counties. Historically, the Diocese of California or the Diocese of the Californias existed from 1840 to 1849, covering both the American and Mexican territories of California. After the Mexican-American War, it was divided into the Diocese of Monterey in California and the Diocese of Tijuana in Mexico.
| Characteristics | Values |
|---|---|
| Number of Catholic Dioceses in California | 4 (Sacramento, Orange, San Diego, and Monterey) |
| Number of Counties Covered by the Diocese of Sacramento | 20 |
| Number of Catholics in the Diocese of Orange | 1.2-1.6 million |
| Number of Parishes in the Diocese of Orange | 57 |
| Number of Pastoral Centers in the Diocese of Orange | 5 |
| Number of Schools in the Diocese of Orange | 36 |
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What You'll Learn
- The Diocese of California, also known as the Diocese of the Californias or Two Californias, existed from 1840 to 1849
- After the Mexican-American War, the Diocese was split into American and Mexican sections
- The Diocese of Orange is the 7th largest diocese in the US, with over 1.6 million members
- The Roman Catholic Diocese of Sacramento serves 20 counties in northern California
- The Diocese of San Diego is committed to sharing the Gospel and promoting a culture of encounter

The Diocese of California, also known as the Diocese of the Californias or Two Californias, existed from 1840 to 1849
The Diocese of California, also interchangeably referred to as the Diocese of the Californias or Two Californias, was established in 1840 by Pope Gregory XVI. It was a Latin Church residential episcopal see that existed until 1849, covering the Californias, including both Alta California and Baja California. The diocese was established with the papal bull Apostolicam sollicitudinem, and Pope Gregory XVI assigned it a large territory that was previously part of the Diocese of Sonora, now the Archdiocese of Hermosillo in Mexico. This territory included Alta California, which corresponds to the present-day American states of California, Nevada, Arizona, Utah, western Colorado, and southwestern Wyoming, as well as the Baja California Territory, which comprises the modern Mexican states of Baja California and Baja California Sur.
The first bishop of the Diocese of California was Francisco Garcia Diego y Moreno, OFM, who served from April 27, 1840, to April 30, 1846. The diocese was established during a time when the Los Angeles region was still a part of Mexico. However, in 1848, Mexican California was ceded to the United States, leading to changes in the diocese.
On November 20, 1849, the episcopal residence was moved to Monterey, marking the formal suppression of the bishopric. As a result, the diocese was divided into two successor jurisdictions: the American section became the Diocese of Monterey, while the Baja California portion, which remained Mexican, was later reorganized as the Vicariate Apostolic of California Inferiore in 1874 and eventually became the Diocese of Tijuana.
The Diocese of California played a significant role in the religious and cultural landscape of the region during its existence from 1840 to 1849. Today, California is home to several Catholic dioceses, including the Diocese of Sacramento, serving 20 counties in northern California, and the Diocese of Orange, which is the 7th largest diocese in the nation with over 1.6 million members. Additionally, the Archdiocese of Los Angeles, a Latin Church archdiocese, serves the southern coastal portion of California and is the largest and most ethnically diverse archdiocese in the United States.
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After the Mexican-American War, the Diocese was split into American and Mexican sections
The history of the Catholic Church in California is a long and complex one, with the first Spanish mission in the region being established over two centuries ago. The Diocese of California, also known as the Diocese of the Californias or Diocese of Two Californias, was established in 1840 by Pope Gregory XVI. This diocese covered a vast territory, including present-day American states such as California, Nevada, Arizona, Utah, and parts of Colorado and Wyoming. It also included the Baja California Territory, which is now part of Mexico.
In 1848, Mexican California was ceded to the United States as a result of the Mexican-American War. This led to a reorganization of the Diocese of California, which was split into American and Mexican sections. The American section became known as the Diocese of Monterey, with its episcopal residence moved to Monterey, a more central location. This diocese included the present-day states of California, Nevada, Utah, and parts of northern California. The Mexican portion, on the other hand, was reorganized into the Diocese of Tijuana over time, with the episcopal residence remaining in San Diego.
The Diocese of Monterey underwent several name changes and splits over the following decades. In 1859, it was renamed the Diocese of Monterey-Los Angeles to reflect the growth of Los Angeles. Then, in 1922, it was renamed the Diocese of Los Angeles-San Diego, and the diocese of San Diego was created. Finally, in 1936, the Diocese of Los Angeles was established and elevated to an archdiocese.
The Diocese of Orange, established in 1976, is another important Catholic diocese in California. With over 1.2 million Catholics and a diverse community, it is one of the largest and most multicultural dioceses in the United States. The diocese has played a significant role in shaping the cultural and community landscape of Orange County and continues to be a spiritual force in the region.
Today, there are several Catholic dioceses in California, serving the large Catholic population in the state. The Archdiocese of Los Angeles, in particular, has been at the center of attention due to its handling of sex abuse scandals, resulting in significant court settlements.
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The Diocese of Orange is the 7th largest diocese in the US, with over 1.6 million members
The Diocese of Orange, also known as the Roman Catholic Diocese of Orange, is the 7th largest diocese in the US, with over 1.6 million members. It is also sometimes referred to as the Diocese of Orange in California to avoid confusion with the Diocese of Orange in Orange, France, which was dissolved in 1801. The Diocese of Orange was erected in 1976 and has 57 parishes, five pastoral centres, and 36 schools. It is one of the largest and most diverse faith communities in the United States.
The Catholic Church has served as a unifying spiritual force in Orange County for the last two centuries. The Diocese of Orange has grown and evolved alongside the county, adapting to changes and controversies. The diocese has a multicultural mission, integrating Asian, Hispanic, and Caucasian ethnicities while respecting their cultures and traditions. The current diocesan bishop is Kevin Vann, who was installed in December 2012.
The Diocese of Orange acquired the Crystal Cathedral campus, which was transformed into a Catholic cathedral. The cathedral, renamed Christ Cathedral, serves as a centre of worship, mission, and culture for the diocese's Catholics and Christians worldwide. The cathedral is also the spiritual home of the diocese and was dedicated on July 17, 2019.
The Diocese of Orange has faced challenges, including a sexual abuse scandal in 2005 that resulted in a $100 million settlement to 87 victims. Despite this, the diocese remains strong and spiritually rich, poised for continued growth in the coming decades.
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The Roman Catholic Diocese of Sacramento serves 20 counties in northern California
The Roman Catholic Diocese of Sacramento, established in 1886, serves 20 counties in northern California. It was formed from the Archdiocese of San Francisco and the Diocese of Grass Valley, which was suppressed by the Vatican. The pope named Reverend Patrick Manogue, then bishop of Grass Valley, as the first bishop of Sacramento.
The Diocese of Sacramento has over 150 parish and mission churches across its 20 counties. As of 2020, the diocese's schools had an enrollment of approximately 13,000 students. As of 2025, there are six high schools in the diocese. The fourth, Bishop Manogue High School, closed in 1993. The diocese also owns Radio Santísimo Sacramento, which operates KCVV in Sacramento and KPYV in Oroville.
The Diocese of Sacramento is not the only Catholic diocese in California. The Diocese of Orange, established in 1976, is the 7th or 11th largest diocese in the nation, with over 1 million Catholics. It has 57 parishes, five pastoral centers, and 36 schools.
In total, there are 196 Catholic dioceses and archdioceses in the United States.
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The Diocese of San Diego is committed to sharing the Gospel and promoting a culture of encounter
The Diocese has a diverse membership, with over 1.2 million Catholics and a multicultural mission that respects and celebrates the various ethnicities and cultures of its members. This commitment to diversity is reflected in the coat of arms of the Diocese, which features symbols of the diversity of ethnic and cultural communities. The Diocese also has a strong educational focus, with 36 schools and nearly 20,000 students enrolled.
The Diocese of San Diego has a history of social justice advocacy, including supporting workers' rights to organize into unions and condemning racist organizations such as the Ku Klux Klan. It has also played an essential role in the founding of the University of San Diego, with the first bishop, Reverend Charles F. Buddy, serving as its first president.
The Diocese of San Diego is just one of several Catholic dioceses in California. The state is also home to the Diocese of Sacramento, which serves 20 counties in Northern California, and the Diocese of Orange, which is the 7th or 11th largest diocese in the nation, depending on the source. These dioceses, along with the Diocese of San Diego, play a vital role in shaping the cultural and community landscape of California.
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Frequently asked questions
There are several Catholic dioceses in California, including the Roman Catholic Diocese of Sacramento, the Diocese of Orange, the Diocese of San Diego, and the Diocese of California (also known as the Diocese of the Californias or Diocese of Two Californias, which covered both sides of the US-Mexico border in California from 1840 to 1849).
The Diocese of Orange is the 7th or 11th largest diocese in the US, with 1.2 to 1.6 million members, 57 parishes, five pastoral centers, and 36 schools. It was established in 1976.
A diocese is a geographic region governed by a bishop. The pastor of a diocese is a bishop, and the diocese empowers Catholics within its geographic boundaries.







































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