State Membership Report
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Illinois

Denominational Groups, 2000

1,279,050 1,177,187 92,297 3,874,933 443,633 5,552,193
Evangelical Protestant Mainline Protestant Orthodox Catholic Other Unclaimed

Congregational "adherents" include all full members, their children, and others who regularly attend services. The historically African American denominations are not included in the 2000 congregation and membership totals. Many are also missing in 1990 and most historically African American denominations are missing in the 1980 reports.
[More information on the data sources]

Reports


Religious Bodies Theology Congregations Adherents Adherence Rate
United Methodist Church, The Mainline Protestant 1,388 365,182 29.4
Catholic Church Catholic 1,125 3,874,933 312.0
Southern Baptist Convention Evangelical Protestant 981 305,838 24.6
Evangelical Lutheran Church in America Mainline Protestant 553 279,724 22.5
Lutheran Church--Missouri Synod Evangelical Protestant 521 278,008 22.4
Christian Churches and Churches of Christ Evangelical Protestant 519 134,325 10.8
Presbyterian Church (U.S.A.) Mainline Protestant 453 133,977 10.8
United Church of Christ Mainline Protestant 390 166,772 13.4
Assemblies of God Evangelical Protestant 337 96,893 7.8
American Baptist Churches in the USA Mainline Protestant 296 87,962 7.1
Churches of Christ Evangelical Protestant 293 29,295 2.4
Church of the Nazarene Evangelical Protestant 247 38,050 3.1
Episcopal Church Mainline Protestant 200 52,578 4.2
Christian Church (Disciples of Christ) Mainline Protestant 170 56,638 4.6
Jewish Estimate Other Theology 161 270,000 21.7
Seventh-day Adventist Church Evangelical Protestant 134 25,046 2.0
Evangelical Free Church of America, The Evangelical Protestant 127 29,402 2.4
Church of God (Cleveland, Tennessee) Evangelical Protestant 123 18,246 1.5
Church of Jesus Christ of Latter-day Saints, The Other Theology 116 35,859 2.9
Church of God (Anderson, Indiana) Evangelical Protestant 105 10,028 0.8
New Testament Association of Independent Baptist Churches and other Fundamental Baptist Associations/Fellowships Evangelical Protestant 89 24,871 2.0
Muslim Estimate Other Theology 79 125,203 10.1
Baptist General Conference Evangelical Protestant 78 19,217 1.6
Free Methodist Church of North America Evangelical Protestant 69 5,818 0.5
Evangelical Covenant Church, The Evangelical Protestant 69 17,759 1.4
General Association of Regular Baptist Churches Evangelical Protestant 69 9,552 0.8
Buddhism Other Theology 63 n.a. n.a.
Salvation Army, The Evangelical Protestant 56 22,765 1.8
International Church of the Foursquare Gospel Evangelical Protestant 56 10,785 0.9
Christian and Missionary Alliance, The Evangelical Protestant 54 6,222 0.5
Community of Christ Evangelical Protestant 54 4,395 0.4
Reformed Church in America Mainline Protestant 53 17,936 1.4
Mennonite Church USA Evangelical Protestant 52 8,589 0.7
Christian Reformed Church in North America Evangelical Protestant 48 18,866 1.5
Independent, Non-Charismatic Churches Evangelical Protestant 47 50,545 4.1
Bahá'í Other Theology 45 5,327 0.4
Church of the Brethren Evangelical Protestant 45 6,206 0.5
Presbyterian Church in America Evangelical Protestant 44 8,570 0.7
National Association of Free Will Baptists Evangelical Protestant 41 4,351 0.4
Cumberland Presbyterian Church Evangelical Protestant 40 2,959 0.2
Unitarian Universalist Association of Congregations Other Theology 36 7,244 0.6
Greek Orthodox Archdiocese of America Orthodox 35 36,801 3.0
Old Order Amish Church Evangelical Protestant 34 2,306 0.2
Wisconsin Evangelical Lutheran Synod Evangelical Protestant 33 9,563 0.8
Conservative Baptist Association of America Evangelical Protestant 33 7,575 0.6
Primitive Baptist Churches--Old Line Evangelical Protestant 33 n.a. n.a.
Hindu Other Theology 30 n.a. n.a.
National Association of Congregational Christian Churches Mainline Protestant 29 4,979 0.4
Wesleyan Church, The Evangelical Protestant 28 6,961 0.6
Churches of God, General Conference Evangelical Protestant 27 4,413 0.4
Friends (Quakers) Mainline Protestant 26 2,358 0.2
Pentecostal Church of God Evangelical Protestant 25 2,460 0.2
Vineyard USA Evangelical Protestant 24 7,282 0.6
Church of God of Prophecy Evangelical Protestant 21 1,118 0.1
American Baptist Association, The Evangelical Protestant 19 1,146 0.1
Apostolic Christian Church of America, Inc. Evangelical Protestant 19 9,812 0.8
International Council of Community Churches Mainline Protestant 17 8,424 0.7
Independent, Charismatic Churches Evangelical Protestant 17 11,398 0.9
Association of Free Lutheran Congregations, The Evangelical Protestant 15 3,959 0.3
Baptist Missionary Association of America Evangelical Protestant 14 1,201 0.1
Church of God General Conference Evangelical Protestant 13 792 0.1
Missionary Church, The Evangelical Protestant 13 3,183 0.3
Evangelical Mennonite Church Evangelical Protestant 12 2,442 0.2
Orthodox Church in America: Territorial Dioceses Orthodox 11 3,428 0.3
North American Baptist Conference Evangelical Protestant 11 2,012 0.2
Conservative Congregational Christian Conference Evangelical Protestant 10 2,146 0.2
Calvary Chapel Fellowship Churches Evangelical Protestant 9 n.a. n.a.
Separate Baptists in Christ Evangelical Protestant 8 567 0.1
Orthodox Presbyterian Church, The Evangelical Protestant 8 808 0.1
Southwide Baptist Fellowship Evangelical Protestant 7 n.a. n.a.
Universal Fellowship of Metropolitan Community Churches Mainline Protestant 6 359 0.0
International Pentecostal Holiness Church Evangelical Protestant 6 223 0.0
Serbian Orthodox Church in the USA Orthodox 5 8,430 0.7
Armenian Apostolic Church / Catholicossate of Etchmiadzin Orthodox 5 4,296 0.4
Serbian Orthodox Church in the USA (New Gracanica Metropolitanate) Orthodox 5 n.a. n.a.
National Primitive Baptist Convention, USA Evangelical Protestant 5 669 0.1
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox 5 1,890 0.2
Amish; Other Groups Evangelical Protestant 5 431 0.0
Apostolic Christian Churches (Nazarene) Evangelical Protestant 4 558 0.0
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox 4 22,785 1.8
Ukrainian Orthodox Church of the USA Orthodox 4 1,728 0.1
International Churches of Christ Evangelical Protestant 4 5,108 0.4
United Reformed Churches in North America Evangelical Protestant 4 860 0.1
Evangelical Presbyterian Church Evangelical Protestant 4 694 0.1
Beachy Amish Mennonite Churches Evangelical Protestant 4 367 0.0
Mennonite; Other Groups Evangelical Protestant 3 186 0.0
Malankara Orthodox Syrian Church, American Diocese of the Orthodox 3 1,000 0.1
Reformed Baptist Churches Evangelical Protestant 3 n.a. n.a.
Armenian Apostolic Church / Catholicossate of Cilicia Orthodox 3 1,421 0.1
Zoroastrian Other Theology 3 n.a. n.a.
Eastern Pennsylvania Mennonite Church Evangelical Protestant 3 286 0.0
Sikh Other Theology 3 n.a. n.a.
Brethren Church, The (Ashland, Ohio) Evangelical Protestant 3 521 0.0
Protestant Reformed Churches in America Evangelical Protestant 3 654 0.1
Russian Orthodox Church Outside of Russia Orthodox 2 n.a. n.a.
Malankara Archdiocese of the Syrian Orthodox Church in North America Orthodox 2 300 0.0
Macedonian Orthodox Church: American Diocese Orthodox 2 1,800 0.1
Orthodox Church in America: Romanian Orthodox Episcopate of America Orthodox 2 3,000 0.2
American Carpatho-Russian Orthodox Greek Catholic Church Orthodox 2 414 0.0
Bulgarian Orthodox Diocese of the USA Orthodox 2 1,260 0.1
Orthodox Church in America: Bulgarian Diocese Orthodox 2 1,986 0.2
Jain Other Theology 2 n.a. n.a.
Progressive Primitive Baptists Evangelical Protestant 2 68 0.0
Conservative Mennonite Conference Evangelical Protestant 2 375 0.0
Brethren In Christ Church Evangelical Protestant 1 63 0.0
Syrian Orthodox Church of Antioch Orthodox 1 270 0.0
Allegheny Wesleyan Methodist Connection Evangelical Protestant 1 18 0.0
Albanian Orthodox Diocese of America Orthodox 1 270 0.0
Tao Other Theology 1 n.a. n.a.
Greek Orthodox Archdiocese of Vasiloupulis Orthodox 1 1,200 0.1
Patriarchal Parishes of the Russian Orthodox Church in the USA Orthodox 1 n.a. n.a.
Holy Orthodox Church in North America Orthodox 1 18 0.0
Reformed Mennonite Church Evangelical Protestant 1 53 0.0
Primitive Methodist Church in the USA Evangelical Protestant 1 61 0.0
Mennonite Brethren Churches, U.S. Conference of Evangelical Protestant 1 14 0.0
Old Order Mennonite Evangelical Protestant 1 35 0.0
Moravian Church in America--Northern Province Mainline Protestant 1 298 0.0
Church of God in Christ, Mennonite Evangelical Protestant 1 30 0.0
Netherlands Reformed Congregations Evangelical Protestant 1 31 0.0
Totals (Unadjusted)*: 10,139 6,867,100  
Total (Adjusted)**:   8,530,523  
The population of these 102 counties (or equivalents) in 1990 was 11,430,602; in 2000 it was 12,419,293. The total population changed 8.6%. The unadjusted adherent totals of the religious groups listed above (6,867,100) include 55.3% of the total population in 2000. The adjusted total adherents (8,530,523) include 68.7% of the population.

Source

*The “Unadjusted Totals” come from the 1990 and 2000 data collected by representatives of the Association of Statisticians of American Religious Bodies (ASARB). While quite comprehensive, this data excludes most of the historically African-American denominations and some other major groups. As a result, these numbers will be an underestimate of the total adherence rate, particularly in areas with a large African-American population. The 2000 data included 149 religious groups and the final results are published in Religious Congregations and Membership in the United States 2000. Copyright © 2002, All rights reserved. The 1990 data included 132 groups and the final results are published in Churches and Church Membership in the United States 1990 Copyright © 1990, All rights reserved. Published by Glenmary Research Center, 1312 Fifth Ave., North, Nashville, TN 37208. www.glenmary.org [More information on the data collection]

**The “Adjusted Totals” include all adherents in the denominations counted by the Association of Statisticians of American Religious Bodies (ASARB) and estimates adherent totals for the historically African-American denominations and other religious groups not listed in the ASARB totals. An article by Roger Finke and Christopher P. Scheitle (2005) reviews how these estimates were computed.

The adherence rate provides the number of adherents of a particular group per 1,000 population. For example, in 2000 the Episcopal Church had an adherence rate of approximately 8 (8.1) in Autauga County, Alabama. This means that 8 out of every 1,000 people in Autauga County are Episcopalian.

[More information on the data source]