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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
Non-denominational Evangelical Protestant
----
1,443 533,464 41.6
United Methodist Church, The Mainline Protestant Methodist/Pietist 1,245 314,461 24.5
Catholic Church Catholic Catholicism 1,082 3,648,907 284.4
Southern Baptist Convention Evangelical Protestant Baptist 1,059 283,519 22.1
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran 503 243,192 19.0
Evangelical Lutheran Church in America Mainline Protestant Lutheran 497 222,698 17.4
Christian Churches and Churches of Christ Evangelical Protestant Baptist 482 131,926 10.3
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed 422 101,312 7.9
United Church of Christ Mainline Protestant Presbyterian-Reformed 351 124,398 9.7
Assemblies of God Evangelical Protestant Pentecostal 320 119,747 9.3
Churches of Christ Evangelical Protestant Baptist 275 26,427 2.1
American Baptist Churches in the USA Mainline Protestant Baptist 274 69,456 5.4
Church of the Nazarene Evangelical Protestant Holiness 223 34,303 2.7
Jehovah's Witnesses Other Adventist 197 --- ---
United Pentecostal Church International Evangelical Protestant Pentecostal 190 --- ---
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism 165 42,623 3.3
Church of God in Christ Black Protestant Pentecostal 163 31,792 2.5
Seventh-day Adventist Church Evangelical Protestant Adventist 158 30,370 2.4
National Baptist Convention, USA, Inc. Black Protestant Baptist 155 103,542 8.1
Christian Church (Disciples of Christ) Mainline Protestant Baptist 153 41,052 3.2
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal 134 16,656 1.3
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints 128 55,750 4.3
African Methodist Episcopal Church Black Protestant Methodist/Pietist 109 23,924 1.9
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist 108 27,188 2.1
Muslim Estimate Other Other Groups 108 359,264 28.0
Church of God (Anderson, Indiana) Evangelical Protestant Holiness 100 8,196 0.6
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist 99 17,640 1.4
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist 78 13,680 1.1
National Missionary Baptist Convention, Inc. Black Protestant Baptist 65 19,317 1.5
General Association of Regular Baptist Churches Evangelical Protestant Baptist 64 --- ---
Orthodox Judaism Other Judaism 63 16,710 1.3
Church of Christ, Scientist Other Christian Science 59 --- ---
Free Methodist Church of North America Evangelical Protestant Holiness 57 5,580 0.4
Christian and Missionary Alliance, The Evangelical Protestant Holiness 53 7,258 0.6
Community of Christ Other Latter-day Saints 53 5,334 0.4
Mennonite Church USA Evangelical Protestant European Free-Church 52 7,587 0.6
Salvation Army Evangelical Protestant Holiness 51 18,379 1.4
Buddhism, Mahayana Other Other Groups 50 21,202 1.7
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist 50 --- ---
Amish Groups, undifferentiated* Evangelical Protestant European Free-Church 47 6,267 0.5
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed 47 16,337 1.3
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 45 7,293 0.6
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal 43 6,823 0.5
Progressive National Baptist Convention, Inc. Black Protestant Baptist 43 15,788 1.2
Reformed Church in America Mainline Protestant Presbyterian-Reformed 43 12,753 1.0
Bahá'í Other Other Groups 41 5,715 0.4
National Association of Free Will Baptists Evangelical Protestant Baptist 41 4,304 0.3
Reform Judaism Other Judaism 41 40,803 3.2
Anglican Church in North America Evangelical Protestant Episcopalianism/Anglicanism 40 --- ---
Full Gospel Baptist Church Fellowship Black Protestant Baptist 39 --- ---
Church of the Brethren Evangelical Protestant European Free-Church 38 4,370 0.3
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran 38 9,143 0.7
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist 37 12,269 1.0
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed 37 2,724 0.2
Unitarian Universalist Association of Congregations Other Liberal 36 8,111 0.6
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) 35 41,364 3.2
Conservative Baptist Association of America Evangelical Protestant Baptist 33 --- ---
Hindu, Post Renaissance Other Other Groups 30 1,010 0.1
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed 26 4,102 0.3
National Baptist Convention of America, Inc. Black Protestant Baptist 26 9,898 0.8
Wesleyan Church, The Evangelical Protestant Holiness 25 5,266 0.4
Hindu, Indian-American Hindu Temple Assoc. Other Other Groups 24 10,441 0.8
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed 24 3,096 0.2
Unity Churches, Association of Other Other Groups 24 --- ---
Buddhism, Theravada Other Other Groups 23 8,805 0.7
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran 23 12,415 1.0
Missionary Church, The Evangelical Protestant Holiness 23 2,923 0.2
Association of Free Lutheran Congregations Evangelical Protestant Lutheran 22 --- ---
Vineyard USA Evangelical Protestant Pentecostal 22 8,568 0.7
Conservative Judaism Other Judaism 21 20,325 1.6
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church 19 9,478 0.7
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) 19 4,469 0.3
Pentecostal Church of God Evangelical Protestant Pentecostal 19 2,068 0.2
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist 18 3,905 0.3
Church of God of Prophecy Evangelical Protestant Pentecostal 18 1,047 0.1
American Baptist Association, The Evangelical Protestant Baptist 15 888 0.1
North American Lutheran Church Evangelical Protestant Lutheran 15 --- ---
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal 15 1,336 0.1
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal 14 --- ---
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed 14 2,621 0.2
Fellowship of Evangelical Churches Evangelical Protestant European Free-Church 14 3,448 0.3
New Apostolic Church of North America, National Organization of the Other Other Groups 14 --- ---
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed 14 1,144 0.1
Buddhism, Vajrayana Other Other Groups 13 1,270 0.1
Friends General Conference* Mainline Protestant European Free-Church 13 736 0.1
International Council of Community Churches Mainline Protestant Presbyterian-Reformed 13 --- ---
Serbian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) 13 9,284 0.7
Korean Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed 12 --- ---
North American Baptist Conference Evangelical Protestant Baptist 12 1,787 0.1
Church of God General Conference Evangelical Protestant Adventist 11 609 0.0
Christian Brethren Evangelical Protestant Ind. Fundamentalist 10 --- ---
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist 10 672 0.1
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist 9 --- ---
Reformed Baptist Churches Evangelical Protestant Baptist 9 --- ---
Hindu, Traditional Temples Other Other Groups 8 8,300 0.6
Korean Presbyterian Church Abroad Evangelical Protestant Presbyterian-Reformed 8 --- ---
National Spiritualist Association of Churches Other Spiritualist 8 --- ---
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) 7 4,521 0.4
Church of God (Seventh Day) Evangelical Protestant Adventist 7 --- ---
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed 7 2,294 0.2
Korean-American Presbyterian Church Evangelical Protestant Presbyterian-Reformed 7 --- ---
Polish National Catholic Church Catholic Catholicism 7 --- ---
Church of Christ (Holiness), U.S.A Evangelical Protestant Holiness 6 --- ---
United Holy Church of America, Inc. Black Protestant Pentecostal 6 --- ---
United Pentecostal Council of the Assemblies of God Evangelical Protestant Pentecostal 6 --- ---
Armenian Church of North America (Catholicosate of Etchmiadzin) Orthodox Eastern Liturgical (Orthodox) 5 2,850 0.2
Church of Our Lord Jesus Christ of the Apostolic Faith, Inc. Black Protestant Pentecostal 5 --- ---
Grace Gospel Fellowship Evangelical Protestant Ind. Fundamentalist 5 --- ---
Hindu, Renaissance Other Other Groups 5 661 0.1
International Pentecostal Holiness Church Evangelical Protestant Pentecostal 5 198 0.0
Ukrainian Orthodox Church of the USA Orthodox Eastern Liturgical (Orthodox) 5 2,290 0.2
Union of Messianic Jewish Congregations Other Judaism 5 --- ---
Friends United Meeting* Mainline Protestant European Free-Church 4 324 0.0
Independent Baptist Fellowship International Evangelical Protestant Baptist 4 --- ---
International Churches of Christ Evangelical Protestant Baptist 4 2,648 0.2
Malankara Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) 4 720 0.1
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups 4 208 0.0
Sikh Other Other Groups 4 --- ---
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed 4 --- ---
American Carpatho-Russian Orthodox Diocese Orthodox Eastern Liturgical (Orthodox) 3 593 0.0
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) 3 2,000 0.2
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church 3 287 0.0
Brethren In Christ Church Evangelical Protestant European Free-Church 3 --- ---
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist 3 59 0.0
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) 3 2,600 0.2
Evangelical Church, The Evangelical Protestant Holiness 3 --- ---
International Fellowship of Bible Churches Evangelical Protestant
----
3 --- ---
Malankara Archdiocese of the Syrian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) 3 522 0.0
Midwest Beachy Amish Mennonite* Evangelical Protestant European Free-Church 3 391 0.0
Pentecostal Fire-Baptized Holiness Church Evangelical Protestant Pentecostal 3 --- ---
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed 3 747 0.1
Russian Orthodox Church Outside of Russia Orthodox Eastern Liturgical (Orthodox) 3 595 0.0
Unaffiliated Conservative Amish Mennonite Church* Evangelical Protestant European Free-Church 3 180 0.0
Alliance of Baptists Mainline Protestant Baptist 2 --- ---
Association of Reformed Baptist Churches of America Evangelical Protestant Baptist 2 --- ---
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church 2 360 0.0
Bulgarian Eastern Orthodox Diocese of the USA, Canada and Australia Orthodox Eastern Liturgical (Orthodox) 2 425 0.0
Church of the Lutheran Confession Evangelical Protestant Lutheran 2 --- ---
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian-Reformed 2 --- ---
Cumberland Presbyterian Church in America Black Protestant Presbyterian-Reformed 2 --- ---
Elim Fellowship Evangelical Protestant Pentecostal 2 --- ---
Eritrean Orthodox Orthodox Eastern Liturgical (Orthodox) 2 610 0.0
Evangelical Association of Reformed, and Congregational Christian Churches Evangelical Protestant Presbyterian-Reformed 2 --- ---
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist 2 --- ---
Friends General Conference and Friends United Meeting, dually aligned meetings* Mainline Protestant European Free-Church 2 299 0.0
Macedonian Orthodox Church: American Diocese Orthodox Eastern Liturgical (Orthodox) 2 1,400 0.1
Reconstructionist Judaism Other Judaism 2 2,330 0.2
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed 2 79 0.0
Romanian Orthodox Archdiocese in Americas Orthodox Eastern Liturgical (Orthodox) 2 740 0.1
Seventh Day Baptist General Conference, USA and Canada Evangelical Protestant Baptist 2 70 0.0
Swedenborgian Church Other Spiritualist 2 --- ---
Syriac Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) 2 560 0.0
Unaffiliated Friends Meetings* Mainline Protestant European Free-Church 2 --- ---
Albanian Orthodox Diocese of America Orthodox Eastern Liturgical (Orthodox) 1 350 0.0
American Association of Lutheran Churches Evangelical Protestant Lutheran 1 --- ---
Apostolic Faith Mission of Portland, OR Evangelical Protestant Pentecostal 1 43 0.0
Assemblies of God International Fellowship Evangelical Protestant Pentecostal 1 --- ---
Berea Amish Mennonite* Evangelical Protestant European Free-Church 1 197 0.0
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church 1 95 0.0
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran 1 260 0.0
Conservative Mennonite Conference Evangelical Protestant European Free-Church 1 142 0.0
Ethiopian Orthodox Orthodox Eastern Liturgical (Orthodox) 1 --- ---
Evangelical Friends Church International* Evangelical Protestant European Free-Church 1 21 0.0
Evangelical Lutheran Synod Evangelical Protestant Lutheran 1 166 0.0
Fundamental Baptist Fellowship Evangelical Protestant Baptist 1 --- ---
Georgian Orthodox Parishes in the United States Orthodox Eastern Liturgical (Orthodox) 1 150 0.0
Holy Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) 1 55 0.0
Hungarian Reformed Churches (Additional) Mainline Protestant Presbyterian-Reformed 1 --- ---
Jain Other Other Groups 1 --- ---
Moravian Church in America--Northern Province Mainline Protestant Methodist/Pietist 1 274 0.0
Patriarchal Parishes of the Russian Orthodox Church in the USA Orthodox Eastern Liturgical (Orthodox) 1 40 0.0
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist 1 --- ---
Reformed Mennonite Church Evangelical Protestant European Free-Church 1 42 0.0
Tampico Amish Mennonite* Evangelical Protestant European Free-Church 1 378 0.0
Tao Other Other Groups 1 --- ---
Zoroastrian Other Other Groups 1 229 0.0
Totals: 12,453 7,094,832  

The population of Illinois was 12,830,632 in 2010; in 2000 it was 12,419,293. The total population changed 3.3%. The adherent totals of the religious groups listed above (7,094,832) included 55.3% of the total population in 2010.

* 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.