
Maryland is home to over a million Catholics, who live, worship, educate, and serve their communities in the Archdiocese of Baltimore, Archdiocese of Washington, and Diocese of Wilmington. The Catholic Church has a long history in the state, with the Diocese of Baltimore being the oldest in the United States, dating back to 1784 when Pope Pius VI placed the prefecture in Baltimore due to its large Catholic population. The Archdiocese of Baltimore is the oldest archdiocese in the country and has an estimated Catholic population of 525,000. Maryland's Catholic community has faced recent challenges, including addressing sexual abuse allegations against clergy and adapting to the rapid growth of artificial intelligence, as outlined in the Maryland Catholic bishops' pastoral letter.
| Characteristics | Values |
|---|---|
| Number of Catholic Dioceses in Maryland | 3 (Archdiocese of Baltimore, Archdiocese of Washington, Diocese of Wilmington) |
| Oldest Diocese in the United States | Archdiocese of Baltimore |
| Date Erected | 6 November 1789 |
| Catholic Population | 525,000 (as of 2020) |
| Number of Diocesan Priests | 198 |
| Number of Religious Priests | 193 |
| Number of Permanent Deacons | 169 |
| Number of Parishes | 139 |
| Number of Schools | 58 (40 elementary and middle schools, 18 high schools) |
| Total Student Enrollment | 24,000 |
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What You'll Learn

The Archdiocese of Baltimore
The Metropolitan Archdiocese of Baltimore (Archidioecesis Baltimorensis in Latin) is the archdiocese of the Latin Church of the Catholic Church in northern and western Maryland in the United States. It is the oldest diocese and oldest archdiocese in the country.
The Catholic population of the United States continued to grow, and in 1808, Pope Pius VII erected four new dioceses from what became the Archdiocese of Baltimore. The pope named Carroll as the first archbishop of Baltimore. In 1800, Carroll ordained the first American-born Catholic priest, Reverend William Matthews, at St. Peter's Pro-Cathedral in Baltimore. In 1806, Carroll began the construction of the Cathedral of the Assumption in Baltimore, now known as the Basilica of the National Shrine of the Assumption of the Blessed Virgin Mary (old Baltimore Cathedral).
In 1939, Pope Pius XII created the Archdiocese of Washington, taking the District of Columbia and five nearby Maryland counties from the Archdiocese of Baltimore. As of 2020, the Archdiocese of Baltimore had an estimated Catholic population of 525,000, with 198 diocesan priests, 193 religious priests, and 169 permanent deacons in 139 parishes. The Archdiocese has two major seminaries: St. Mary's Seminary and University in Baltimore and Mount St. Mary's Seminary in Emmitsburg. It also has 40 elementary and middle schools and 18 high schools, with a total student enrollment of approximately 24,000.
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The Roman Catholic Archdiocese of Baltimore
There are three Roman Catholic dioceses in Maryland: the Archdiocese of Baltimore and the dioceses of Wilmington and Wheeling-Charleston. Now, here is some detailed information about the Archdiocese of Baltimore.
Baltimore's archdiocese has a rich history that traces back to the early days of Catholicism in the United States. It was established at a time when the nation was still in its infancy and played a crucial role in shaping the development of the Catholic Church in America. The archdiocese has a long tradition of educational excellence and social service, with numerous schools, universities, and charities under its auspices. Today, it continues to be a vibrant and diverse community, serving the spiritual needs of Catholics in central Maryland.
The current archbishop of Baltimore is William E. Lori, who was installed in 2012. He is the 16th bishop and 14th archbishop of Baltimore, succeeding Edwin Frederick O'Brien, who was appointed Grand Master of the Equestrian Order of the Holy Sepulchre of Jerusalem. The archdiocese is also home to several auxiliary bishops who assist the archbishop in pastoral duties across the large archdiocese.
Some notable churches and shrines within the Archdiocese of Baltimore include the Basilica of the National Shrine of the Assumption of the Blessed Virgin Mary, which is the first cathedral built in the United States and a significant landmark in American Catholic history. There is also the National Shrine of St. Alphonsus Liguori, which honors the patron saint of confessors, and the St. Mary's Seminary and University, the first Catholic seminary in the United States, which continues to form future priests today.
The Archdiocese of Baltimore continues to play a vital role in the life of the Catholic Church in the United States. It is an active participant in the US Conference of Catholic Bishops (USCCB) and contributes to national discussions on faith and moral issues. Through its parishes, schools, and charities, the archdiocese serves as a beacon of hope and faith for Catholics in Maryland and beyond.
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The Archdiocese of Washington
In 1789, Pope Pius VI erected the Diocese of Baltimore, covering the entire United States, including the state of Maryland. The present-day District of Columbia was part of the British Province of Maryland at the time and remained part of the Diocese of Baltimore for the next 150 years.
However, in 1939, Pope Pius XII established the Archdiocese of Washington, taking the District of Columbia and five nearby Maryland counties from the Archdiocese of Baltimore. The pope initially appointed Michael Curley, then Archbishop of Baltimore, to also serve as Archbishop of Washington. Curley used the title of Archbishop of Baltimore-Washington during this period, although the two archdioceses remained separate entities.
After Curley's death in 1947, Pius XII appointed separate archbishops for Baltimore and Washington. Monsignor Patrick A. O'Boyle from the Archdiocese of New York became the new Archbishop of Washington, and he racially integrated the Catholic schools in Washington and then the Maryland counties in the diocese. O'Boyle served until 1973, overseeing significant growth in the Catholic population of the archdiocese.
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The Catholic population of Maryland
Maryland is home to over one million Catholics, who live, worship, educate, and serve their communities in the Archdiocese of Baltimore, Archdiocese of Washington, and Diocese of Wilmington. The Catholic population of Maryland is concentrated in the Archdiocese of Baltimore, which is the oldest diocese and archdiocese in the United States. It was established in 1784 when Pope Pius VI placed the prefecture see in Baltimore, as Maryland had the largest Catholic population in the country at the time. In 1808, the diocese was elevated to an archdiocese. As of 2020, the archdiocese had an estimated Catholic population of 525,000, with 198 diocesan priests, 193 religious priests, and 169 permanent deacons serving 139 parishes. The Archdiocese of Baltimore is also home to a diverse range of Catholic institutions, including 40 elementary and middle schools, 18 high schools, and several basilicas and shrines.
The Archdiocese of Washington, which was established in 1939 by Pope Pius XII, also has a significant Catholic population in Maryland. The archdiocese encompasses the District of Columbia and five nearby Maryland counties. However, specific population estimates for this archdiocese are not readily available.
The Diocese of Wilmington, which serves the Catholic population in the state of Delaware, also includes parts of Maryland's Eastern Shore. Unfortunately, there is limited information available regarding the Catholic population specifically within this diocese in Maryland.
Overall, Maryland's Catholic population is predominantly associated with the Archdiocese of Baltimore, which has a rich history and continues to serve a large number of Catholics in the state. The Archdiocese of Washington and the Diocese of Wilmington also play essential roles in the religious landscape of Maryland, contributing to its diverse and vibrant Catholic community.
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The Maryland Catholic Conference
The Archdiocese of Baltimore is the oldest diocese and archdiocese in the United States. It was established in 1784 by Pope Pius VI, who placed the prefecture in Baltimore due to Maryland's large Catholic population. In 1789, the diocese was elevated, and it covered the entire nation until the establishment of additional dioceses. The current archbishop of Baltimore is William E. Lori, who ordained five men to the priesthood at the Cathedral of Mary Our Queen in June 2025. The archdiocese has a rich history, with figures such as Deacon Bienvenu Ilanga, whose journey from the Democratic Republic of Congo to Baltimore is a testament to faith and perseverance.
The Archdiocese of Washington was established in 1939 by Pope Pius XII, who took the District of Columbia and five Maryland counties from the Archdiocese of Baltimore. This archdiocese has also faced issues with sexual abuse allegations, with former Auxiliary Bishop Gordon Bennett banned from ministry in 2019 due to accusations. The Maryland Catholic Conference addresses issues such as artificial intelligence, providing a framework for Catholics to navigate this rapidly growing field.
The Diocese of Wilmington, though I could not find much specific information about it, is another important part of the Catholic Church in Maryland, serving a large Catholic population in the state.
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Frequently asked questions
There are three Catholic dioceses in Maryland: the Archdiocese of Baltimore, the Archdiocese of Washington, and the Diocese of Wilmington.
The Archdiocese of Baltimore is the oldest diocese and archdiocese in the United States. It was erected in November 1784 by Pope Pius VI as the Prefecture Apostolic of the United States, encompassing the entire country. In 1789, it was elevated to the Diocese of Baltimore, becoming the first diocese solely within the United States.
As of 2020, the Archdiocese of Baltimore had an estimated Catholic population of 525,000 with 198 diocesan priests, 193 religious priests, and 169 permanent deacons in 139 parishes.




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