
The first diocese established in North America was in Greenland, when Viking Leif Erikson brought Catholic missionaries with him from Norway in the year 1000. However, the first diocese established within the boundaries of the original United States was the Diocese of Baltimore, established in 1789. This was due to Maryland being one of the few regions of the new country with a large Catholic population.
| Characteristics | Values |
|---|---|
| Date of establishment | November 6, 1789 |
| Location | Baltimore |
| First Bishop | John Carroll |
| Current Catholic Population in the US | 23% of the total population (2018) |
| Number of Archdioceses/Dioceses in the US | 194 |
| Number of geographical Archdioceses/Dioceses in the US | 196 |
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What You'll Learn
- Catholicism was first introduced to the territories that now form the US by Spanish colonists in the 16th century
- The first Catholic diocese in North America was Greenland, established in 1124
- The first Catholic Mass in what would become the US was held in 1526
- The first diocese in the US was the Diocese of Baltimore, established in 1789
- The first American-born head of the Catholic Church in the US was Father John Carroll

Catholicism was first introduced to the territories that now form the US by Spanish colonists in the 16th century
The first clerics to arrive came from Mexico and belonged to spiritual fraternities. They were tasked with the Hispanicization of the Indigenous people, and their primary challenge was in translating Christian concepts and beliefs. Initially, they relied on images that illustrated biblical stories and dogma to communicate these ideas. They also introduced Western European concepts of time through sacramental rites and the yearly Christian calendar, which they enforced by ringing bells at their centrally located churches.
Spanish efforts to establish a permanent settlement in the 16th century were largely unsuccessful until French Huguenots threatened their trade routes by settling at the St. John's River in modern-day Jacksonville at Fort Caroline. In response, the Spanish founded St. Augustine and drove out the French before establishing the first Indian mission led by a secular priest, Sebastian Montero, from 1566 to 1572.
The first known Catholic Mass held in what would become the United States was in 1526 by Dominican friars Antonio de Montesinos and Anthony de Cervantes, who ministered to the San Miguel de Gualdape colonists during the three months that the colony existed. Catholicism was also introduced to the present-day Virgin Islands in 1493, Puerto Rico in 1508, Florida in 1513, South Carolina in 1566, and Georgia from 1568 to 1684.
During the colonial period, most of the Catholic population in the United States came from England, Germany, and France, with a notable presence of Irish Catholics in Maryland and Pennsylvania. By the end of the American Revolutionary War in 1783, there were approximately 24,000 to 25,000 Catholics in the United States out of a total population of approximately 3 million. The first diocese in the United States was established in Baltimore, Maryland, on November 6, 1789, due to the large Catholic population in the region.
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The first Catholic diocese in North America was Greenland, established in 1124
The first Catholic diocese in North America was established in Greenland in 1124. This came about a century after Viking Leif Erikson, son of Erik the Red, brought Catholic missionaries to Greenland from Norway in the year 1000. Leif, who was raised in Greenland, had travelled to Norway and was received by the great Viking warrior, King Olaf. By then, Olaf had converted to Christianity and been baptised. He instructed Leif in the Catholic religion, and Leif felt compelled to return to Greenland with the gospel.
Olaf sent missionaries to accompany Leif on his return journey to Greenland. Although Leif could not convert his father, his mother accepted the Catholic faith with great enthusiasm. She persuaded her husband to finance the construction of a church, Thjódhildur's Church, at Brattahlid. This was the first Christian church built on the North American continent.
In 1124, Pope Honorius II consecrated a bishop for Greenland, establishing it as a diocese. The episcopal residence was situated at Gardar (present-day Igaliku) close to Brattahlid (today’s Qassiarsuk). King Olaf's support for the missionaries led to the conversion of almost all of Norway to the Catholic religion.
The first diocese within the boundaries of the original United States was the Diocese of Baltimore, established in 1789. This was due to Maryland being one of the few regions of the new country with a large Catholic population. The first American-born head of the Catholic Church in the United States was Father John Carroll, a former Jesuit, who became the bishop of Baltimore.
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The first Catholic Mass in what would become the US was held in 1526
The first Catholic Mass in what would later become the United States was held in 1526. This Mass was celebrated by Dominican friars Fr. Antonio de Montesinos and Fr. Anthony de Cervantes. They ministered to the San Miguel de Gualdape colonists for the three months that the colony existed. The settlement was located near present-day Georgetown, South Carolina.
The first diocese established in North America was not in Mexico City or Quebec but in Greenland. Viking Leif Erikson brought Catholic missionaries with him when he sailed from Norway to Greenland in 1000 CE. Erikson's father, Erik the Red, had established a colony at Brattahlid in 986 CE, and Erikson himself was raised in Greenland. After his own baptism, Erikson felt compelled to return to Greenland to spread the gospel. Accompanied by missionaries sent by King Olaf, Erikson financed the construction of Thjódhildur's Church at Brattahlid—the first Christian church in North America. In 1124, Pope Honorius II consecrated a bishop for Greenland, officially establishing it as a diocese.
In the territories that now constitute the United States, Catholicism was first introduced by Spanish colonists in the present-day Virgin Islands in 1493, Puerto Rico in 1508, Florida in 1513, South Carolina in 1566, and Georgia from 1568 to 1684. The first diocese in what would become the United States was the Diocese of Baltimore, established in 1789 due to Maryland's large Catholic population.
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The first diocese in the US was the Diocese of Baltimore, established in 1789
The first diocese in the US was the Diocese of Baltimore, established on November 6, 1789. The Holy See established the Apostolic Prefecture of the United States on November 26, 1784, and because Maryland had a large Catholic population, the apostolic prefecture was elevated to become the Diocese of Baltimore.
The establishment of the Diocese of Baltimore gave it pre-eminence over all future dioceses in the US. It was further elevated to the status of an archdiocese on April 8, 1808. In 1858, the Sacred Congregation for the Propagation of the Faith, with the approval of Pius IX, gave the archdiocese of Baltimore the "Prerogative of Place". This decree gave the archbishop of Baltimore precedence over all the other archbishops in the United States (but not cardinals) in councils, gatherings, and meetings of any kind within the hierarchy.
The first bishop of the Diocese of Baltimore was John Carroll (1735–1815), a former Jesuit. He became the first American-born head of the Catholic Church in the United States. Carroll also orchestrated the founding and early development of Georgetown University, which began instruction on November 22, 1791. On March 29, 1800, Carroll ordained William Matthews as the first British-America-born Catholic priest ordained in America.
The Roman Catholic Church in the United States is part of the worldwide Latin Church and the wider Catholic Communion, in communion with the Pope of Rome. With 23% of the US population as of 2018, the Roman Catholic Church is the country's second-largest religious grouping after Protestantism. The United States has the fourth-largest Roman Catholic population in the world, after Brazil, Mexico, and the Philippines.
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The first American-born head of the Catholic Church in the US was Father John Carroll
The first Catholic diocese in America was established in Baltimore, Maryland, in 1789. This was due to Maryland being one of the few regions in the country with a large Catholic population.
Carroll returned to Baltimore in 1774 due to the suppression of the Jesuits by the Pope. In 1789, he was appointed Bishop of Baltimore, a diocese that at the time encompassed the entire United States. He was consecrated in 1790 and played a key role in the establishment of institutions for the training and ordination of native-born priests. He founded the Sulpician seminary in Baltimore in 1791 and encouraged Roman Catholic religious orders to establish branches in the US. He also collaborated with Benjamin Latrobe on the planning and design of the Baltimore cathedral, laying its cornerstone in 1806.
During his time as head of the American church, the Roman Catholic population in the country grew significantly, from about 25,000 to 200,000. In 1808, with the erection of four new sees (Boston, New York, Philadelphia, and Bardstown, Kentucky), Carroll became the first Archbishop of Baltimore in 1811.
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Frequently asked questions
A diocese is a territorial unit administered by a bishop.
The first diocese established in North America was in Greenland. Viking Leif Erikson brought Catholic missionaries with him when he sailed to Greenland from Norway in the year 1000.
The first diocese in the United States was the Diocese of Baltimore, established on November 6, 1789.
Maryland was one of the few regions of the colonial United States that was predominantly Catholic.
The USCCB is an assembly of the Catholic Church hierarchy of the United States and the U.S. Virgin Islands.











































