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Illinois

Religious Traditions, 2010

1,649,402 220,435 933,690 76,138 3,648,907 566,260 5,735,800
Evangelical Protestant Black Protestant Mainline Protestant Orthodox Catholic Other Unclaimed

Congregational adherents include all full members, their children, and others who regularly attend services. The 2010 reports contain incomplete counts of congregations and adherents belonging to the eight largest historically African-American denominations. These denominations are not included in the 2000 reports and are largely missing from the 1990 and 1980 reports.
[More information on the data sources]

Reports


Religious Bodies Tradition Family Congregations Adherents Adherence Rate
United Methodist Church, The Mainline Protestant Methodist/Pietist 1,534 505,406 44.2
Catholic Church Catholic Catholicism 1,235 3,600,862 315.1
Southern Baptist Convention Evangelical Protestant Baptist 890 264,480 23.1
Evangelical Lutheran Church in America Mainline Protestant Lutheran 574 319,597 28.0
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 506 313,425 27.4
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 498 194,180 17.0
Christian Churches and Churches of Christ Evangelical Protestant Restoration Movement 469 110,783 9.7
United Church of Christ Mainline Protestant Presbyterian-Reformed 429 191,865 16.8
Churches of Christ Evangelical Protestant Restoration Movement 306 31,644 2.8
American Baptist Churches in the USA Mainline Protestant Baptist 299 104,795 9.2
Assemblies of God Evangelical Protestant Pentecostal 292 62,662 5.5
Church of the Nazarene Evangelical Protestant Holiness 259 48,677 4.3
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 210 74,488 6.5
Christian Church (Disciples of Christ) Mainline Protestant Restoration Movement 204 73,479 6.4
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 141 12,455 1.1
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 116 26,763 2.3
Seventh-day Adventist Church Evangelical Protestant Adventist 102 17,631 1.5
Free Methodist Church of North America Evangelical Protestant Holiness 81 17,670 1.5
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 70 16,404 1.4
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 68 11,650 1.0
Jewish Other Judaism 68 46,031 4.0
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 63 23,671 2.1
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 62 15,082 1.3
Reformed Church in America Mainline Protestant Presbyterian-Reformed 54 21,288 1.9
Salvation Army Evangelical Protestant Holiness 52 22,313 2.0
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 46 3,193 0.3
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 44 16,633 1.5
Mennonite Church Evangelical Protestant European Free-Church 44 6,150 0.5
Church of the Brethren Evangelical Protestant European Free-Church 42 7,236 0.6
Christian Brethren Evangelical Protestant Ind. Fundamentalist 41 4,115 0.4
Unitarian Universalist Association of Congregations Other Liberal 41 9,303 0.8
Conservative Baptist Association of America Evangelical Protestant Baptist 40 10,804 0.9
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 34 9,969 0.9
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 32 9,342 0.8
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 32 5,104 0.4
Christian and Missionary Alliance, The Evangelical Protestant Holiness 31 3,349 0.3
Friends (Quakers) Mainline Protestant European Free-Church 28 2,375 0.2
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist 27 21,877 1.9
Social Brethren Other Other Groups 24 1,456 0.1
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 22 3,451 0.3
Mennonite Church, The General Conference Evangelical Protestant European Free-Church 18 3,348 0.3
Missionary Church, The Evangelical Protestant Holiness 16 2,227 0.2
Baptist Missionary Association of America Evangelical Protestant Baptist 15 1,072 0.1
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 14 18,426 1.6
North American Baptist Conference Evangelical Protestant Baptist 14 2,639 0.2
American Baptist Association, The Evangelical Protestant Baptist 13 1,225 0.1
Old Order Amish Evangelical Protestant European Free-Church 13 2,047 0.2
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist 12 1,349 0.1
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 12 1,304 0.1
Church of God General Conference Evangelical Protestant Adventist 11 759 0.1
Bethel Ministerial Association, Inc. Evangelical Protestant Pentecostal 10 1,497 0.1
Advent Christian Church Evangelical Protestant Adventist 9 1,351 0.1
Separate Baptists in Christ Evangelical Protestant Baptist 9 654 0.1
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 7 1,445 0.1
Fellowship of Evangelical Churches Evangelical Protestant European Free-Church 6 1,120 0.1
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 5 545 0.0
Apostolic Christian Churches (Nazarene) Evangelical Protestant European Free-Church 4 291 0.0
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist 4 177 0.0
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 4 112 0.0
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) 3 577 0.1
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 3 808 0.1
Estonian Evangelical Lutheran Church Mainline Protestant Lutheran 3 742 0.1
Evangelical Church, The Evangelical Protestant Holiness 3 86 0.0
Evangelical Lutheran Synod Evangelical Protestant Lutheran 3 534 0.0
Latvian Evangelical Lutheran Church in America Mainline Protestant Lutheran 3 1,219 0.1
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 3 940 0.1
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed 3 138 0.0
Christ Catholic Church Evangelical Protestant Catholicism 2 106 0.0
Christian Catholic Church Other Other Groups 2 2,050 0.2
Church of God (Seventh Day) Evangelical Protestant Adventist 2 47 0.0
Reformed Episcopal Church Evangelical Protestant Episcopalianism/Anglicanism 2 377 0.0
Seventh Day Baptist General Conference, USA and Canada Evangelical Protestant Baptist 2 85 0.0
Swedenborgian Church Other Spiritualist 2 145 0.0
Syriac Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) 2 845 0.1
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 1 152 0.0
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 1 182 0.0
Brethren In Christ Church Evangelical Protestant European Free-Church 1 73 0.0
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 1 208 0.0
Church of the Lutheran Confession Evangelical Protestant Lutheran 1 63 0.0
Congregational Holiness Church Evangelical Protestant Pentecostal 1 21 0.0
Fire Baptized Holiness Church, (Wesleyan), The Evangelical Protestant Holiness 1 9 0.0
General Church of the New Jerusalem Other Spiritualist 1 259 0.0
Moravian Church in America--Northern Province Mainline Protestant Methodist/Pietist 1 468 0.0
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist 1 194 0.0
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 1 435 0.0
Romanian Orthodox Archdiocese in Americas Orthodox Eastern Liturgical (Orthodox) 1 2,957 0.3
U.S. Mennonite Brethren Evangelical Protestant European Free-Church 1 49 0.0
Ukrainian Orthodox Church of the USA Orthodox Eastern Liturgical (Orthodox) 1 340 0.0
Totals: 9,358 6,297,355  

The population of Illinois was 11,426,518 in 1980. The adherent totals of the religious groups listed above (6,297,355) included 55.1% of the total population in 1980.

* In an effort to better match the ASARB standards for adherents, a few religious bodies changed the way their adherents were reported in 2010, including the Catholic Church, Amish groups, Friends groups, Jewish groups, the Church of Jesus Christ of Latter-day Saints, Non-denominational Christian Churches, and the United Methodist Church. This change does not affect any of the data in the newly released 2010 U.S. Religion Census: Religious Congregations & Membership Study. In fact, the data for these groups are now more comparable to that of other bodies than it was in previous decadal reports.

However, the change in methodology can distort assessments on growth or decline between 2000 and 2010 for each of these groups. County-level 2000 data using the new methodology are not readily available. ASARB staff has adjusted some 2000 county-level adherent statistics to allow for a more accurate picture on growth or decline. The revised maps and charts are now available on-line at www.usreligioncensus.org for those who are interested in these trends.

Source

2010 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include statistics for 236 religious groups, providing information on the number of their congregations and adherents within each state and county in the United States. Clifford Grammich, Kirk Hadaway, Richard Houseal, Dale E. Jones, Alexei Krindatch, Richie Stanley and Richard H. Taylor supervised the collection. These data originally appeared in 2010 U.S. Religion Census: Religious Congregations & Membership Study, published by the Association of Statisticians of American Religious Bodies (ASARB). [More information on the data collection]

The adherence rate provides the number of adherents of a particular group per 1,000 population. For example, in 2010 the Episcopal Church had an adherence rate of 7.6 in Autauga County, Alabama. This means that about 8 out of every 1,000 people in Autauga County were Episcopalian.


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