
Illinois is divided into six Catholic dioceses, or regions: Chicago, Belleville, Joliet, Peoria, Rockford, and Springfield. The Catholic Conference of Illinois (CCI) was created in 1969 to serve as the public policy voice of the Illinois bishops and lay Catholics. The state's 3.5 million Catholics make up 27% of the total state population of 12.8 million.
| Characteristics | Values |
|---|---|
| Number of Catholic Dioceses in Illinois | 6 |
| Catholic Dioceses in Illinois | Chicago, Belleville, Joliet, Peoria, Rockford, and Springfield |
| Year the Diocese of Joliet was formed | 1948 |
| Number of counties covered by the Diocese of Joliet | 7 |
| Year Chicago was raised to metropolitan rank | 1880 |
| First black to head a diocese in Illinois | Wilton D. Gregory |
| Year the Catholic Conference of Illinois was created | 1969 |
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What You'll Learn

Illinois' Catholic population
Illinois is a state in the United States, which has the fourth-largest Catholic population in the world. In 2018, 23% of the United States population was Catholic, making it the second-largest religious grouping in the country after Protestantism. A 2020 Gallup poll showed that 25% of Americans identified as Catholic.
The Catholic Church has had a significant cultural, social, and political impact on the United States. This influence dates back to the founding of the Thirteen Colonies, when the Province of Maryland was established as "a Catholic Proprietary" in the 17th century. By the time the American War for Independence began in 1776, Catholics formed 1.6% of the population of the 13 colonies, or approximately 40,000 people.
The number of Catholics in the United States surged in the 1840s with the arrival of large numbers of German, Irish, and other European Catholics. This period also saw the emergence of separate parishes for major ethnic groups, including those from Ireland, Germany, Poland, French Canada, and Italy. The Catholic Revival during this time, known as "Ultramontanism," fostered a sense of moral superiority among Catholics living in urban neighbourhoods, parishes, schools, and associations.
Between 1860 and 1890, the Catholic population in the United States tripled to seven million, with Italians and Poles forming the largest groups of new Catholics. While the current Catholic population in Illinois is unclear, the state is home to the Archdiocese of Chicago, which suggests a significant Catholic presence.
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History of the Catholic Church in Illinois
The history of the Catholic Church in Illinois dates back to the 17th century when the region was part of the French colony of New France. The first Catholic presence in what is now Illinois was that of French Jesuit missionary Reverend Jacques Marquette, who arrived at the mouth of the Chicago River on December 4, 1674. Marquette's cabin, built for the winter, became the first European settlement in the area. In the following years, more French missionaries and settlers arrived in the region. In 1696, Reverend Jacques Gravier, another French Jesuit, founded the Illinois mission among the Illinois, Miami, Kaskaskia, and other tribes of the Illiniwek confederacy in the Mississippi and Illinois River valleys.
In 1789, Pope Pius VI established the Diocese of Baltimore, which covered the entire United States. In 1822, Alexander Beaubien became the first person to be baptised as a Catholic in Chicago. As the Catholic population in Chicago grew, the Vatican created the Diocese of St. Louis in 1826, encompassing Illinois and other regions of the American Midwest. In 1833, Jesuit missionaries in Chicago requested a priest to serve the 100 Catholics in the city, and Reverend John Saint Cyr became the city's first resident priest. Saint Cyr constructed and dedicated St. Mary, Chicago's first Catholic church, in 1833.
In 1843, Pope Gregory XVI erected the Diocese of Chicago, which covered all of Illinois, taking territory from the Dioceses of St. Louis and Vincennes. The following year, Reverend William Quarter of Ireland was appointed as Chicago's first bishop. Under his leadership, the diocese was organised, and a state law was passed in 1845, granting the bishop of Chicago the power to hold real estate and other property. In 1880, the Diocese of Chicago was elevated to an archdiocese by the Vatican.
Illinois was also home to Augustus Tolton, the first recognised black American priest. Born a slave in Missouri in 1854, he was brought to Quincy, Illinois, during the Civil War and educated by a German priest. After studying in Rome, he was ordained in 1886 and became a pastor in Quincy. He later moved to Chicago at his request and served as the founding pastor of St. Monica's Parish until his death in 1897.
Today, the Roman Catholic Church in Illinois consists of six dioceses: the Archdiocese of Chicago and the suffragan dioceses of Belleville, Joliet, Peoria, Rockford, and Springfield. The Archdiocese of Chicago, with its cathedral parish, Holy Name Cathedral, serves over 2 million Catholics in Cook and Lake counties. The Illinois Catholic Church has a rich history and continues to play a significant role in the religious and social life of the state.
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The Catholic Conference of Illinois
The state of Illinois is divided into six Catholic dioceses or regions: Chicago, Belleville, Joliet, Peoria, Rockford, and Springfield. Illinois has a Catholic population of 3.5 million, which makes up 27% of the state's total population of 12.8 million. The CCI works to serve the Church's mission through various vocations and religious institutions.
The CCI is composed of departments or areas of interest that focus on issues key to the Church's interests. These include Catholics for Life, Marriage and Family, Education, Social Services, and Healthcare. There are also ad-hoc committees that address other topics as needed. The CCI also coordinates a statewide effort of prison and jail ministry offered through the dioceses. Lay Catholics are trained to offer hope to inmates through the salvation of the Gospel.
The CCI focuses on issues that reflect the Church's mission, such as Catholic education, immigration reform, social service initiatives, and social justice efforts. They work to protect the sanctity of life and advocate for criminal justice reforms and environmental concerns. In collaboration with the United States Conference of Catholic Bishops, the CCI supported Senate Bill 292 and H.R. 833, which proposed the Educational Choice for Children Act to provide $10 billion in annual scholarships to students. The CCI also opposed bills to legalize assisted suicide in Illinois, such as SB 1950 and SB 9, arguing that they threaten the dignity of human life and put vulnerable populations at risk.
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The Diocese of Joliet
There are six Catholic dioceses in Illinois: the Archdiocese of Chicago, the Diocese of Belleville, the Diocese of Joliet, the Diocese of Peoria, the Diocese of Rockford, and the Diocese of Springfield in Illinois. Each diocese is led by a bishop, and the Archdiocese of Chicago is headed by a metropolitan archbishop, currently Cardinal Blase Cupich. Now, here is some detailed information about the Diocese of Joliet:
The Cathedral of St. Raymond Nonnatus in Joliet serves as the mother church of the diocese and the seat of the diocesan bishop. The current bishop of Joliet is Robert Daniel Conlon, who was appointed by Pope Benedict XVI on May 17, 2011. The diocese also has a co-cathedral, the Cathedral of St. Raymond, in Joliet, which was elevated to co-cathedral status in 2014. This elevation allowed for the installation of the bishop, as the Cathedral of St. Raymond Nonnatus could not accommodate the large number of priests and faithful who attend the ceremony.
Social justice and charitable works are also important aspects of the Diocese of Joliet's mission. The diocese operates Catholic Charities of the Diocese of Joliet, which provides a range of social services to those in need, regardless of their religious affiliation. These services include food pantries, shelters for the homeless, immigration legal services, and support for pregnant women and new mothers. The diocese is also committed to promoting respect for life at all stages, from conception to natural death, and actively opposes practices such as abortion and euthanasia.
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Chicago's role in the Catholic Church
Illinois is home to several Catholic dioceses, including Belleville, Joliet, Peoria, Rockford, and Springfield, and the Archdiocese of Chicago. Chicago, in particular, has played a significant role in the history and development of the Catholic Church in the state and beyond.
The presence of the Catholic Church in Chicago dates back to the early 19th century. In 1833, Reverend John Saint Cyr, a French priest, celebrated the first Catholic mass in the city in a log cabin on Lake Street. Saint Cyr was appointed by Bishop Rosati, who responded to the pleas of the city's 100 Catholics for a resident priest. Saint Cyr then constructed St. Mary's, a small wooden church near Lake and State Streets, which became the first Catholic church in Chicago.
The following year, in 1834, Bishop Simon Bruté of the Diocese of Vincennes in Indiana visited Chicago and found that the city's growing Catholic population was still only served by a single priest. This highlights the early challenges faced by the Catholic community in Chicago and the need for more infrastructure and clergy to support their religious needs.
The Catholic Church in Chicago continued to grow and develop over the next few decades. In 1846, the Sisters of Mercy were invited to the city, and they played a pivotal role in establishing educational institutions. Within six years, they had founded schools, orphanages, and an academy. One notable project was the St. Xavier Female Seminary, a secondary school that attracted students from both wealthy Catholic and Protestant families, reflecting the inclusive nature of their educational endeavours.
Cardinal Joseph Bernardin, who served as the archbishop of Chicago from 1982 to 1996, was a prominent figure in the American Catholic Church during the post–Vatican II era. He rallied progressives with his "seamless garment ethic" and ecumenical initiatives, shaping the Catholic Church's engagement with social and theological issues during his tenure.
Overall, Chicago has been a crucial centre for the Catholic Church in Illinois and the United States as a whole. The city has a rich history of Catholic presence, from its early days with Saint Cyr to the establishment of educational institutions and the influential leadership of figures like Cardinal Joseph Bernardin. The Archdiocese of Chicago continues to play an active role in the religious, educational, and social landscape of the region.
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Frequently asked questions
There are six Catholic dioceses in Illinois.
The six dioceses in Illinois are Chicago, Belleville, Joliet, Peoria, Rockford, and Springfield.
The CCI was created in 1969 to be the public policy voice of the Illinois bishops and lay Catholics. It interacts with state government to promote and defend the interests of the Church.
The CCI enables the six dioceses of the state to develop, coordinate, and implement interdiocesan programs. It also works with other religious, secular, and governmental organizations to promote the social and moral welfare of the people of Illinois.
The CCI is governed by a board of directors composed of the six diocesan bishops of the state, all auxiliary and retired bishops, one priest, one layman, and one laywoman from each diocese, and four religious members.











































