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