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	1,089	3,611,033	315.9
United Methodist Church, The	Mainline Protestant	1,480	440,681	38.6
Black Baptists Estimate	Evangelical Protestant	n.a.	397,339	34.8
Evangelical Lutheran Church in America	Mainline Protestant	568	296,968	26.0
Lutheran Church--Missouri Synod	Evangelical Protestant	519	295,820	25.9
Southern Baptist Convention	Evangelical Protestant	917	292,644	25.6
Jewish Estimate	Other Theology	184	269,188	23.6
United Church of Christ	Mainline Protestant	411	185,558	16.2
Presbyterian Church (U.S.A.)	Mainline Protestant	474	158,320	13.9
Christian Churches and Churches of Christ	Evangelical Protestant	498	119,161	10.4
American Baptist Churches in the USA	Mainline Protestant	296	96,440	8.4
Assemblies of God	Evangelical Protestant	339	80,656	7.1
Christian Church (Disciples of Christ)	Mainline Protestant	202	65,546	5.7
Episcopal Church	Mainline Protestant	184	54,751	4.8
Independent, Non-Charismatic Churches	Evangelical Protestant	40	48,055	4.2
Church of the Nazarene	Evangelical Protestant	268	42,056	3.7
Churches of Christ	Evangelical Protestant	298	33,334	2.9
Church of Jesus Christ of Latter-day Saints, The	Other Theology	85	30,352	2.7
Apostolic Catholic Assyrian Church of the East, North American Dioceses	Orthodox	3	27,182	2.4
Seventh-day Adventist Church	Evangelical Protestant	129	24,442	2.1
Reformed Church in America	Mainline Protestant	56	20,196	1.8
Evangelical Free Church of America, The	Evangelical Protestant	89	19,601	1.7
African Methodist Episcopal Zion Church	Evangelical Protestant	14	18,426	1.6
Christian Reformed Church in North America	Evangelical Protestant	51	17,390	1.5
Baptist General Conference	Evangelical Protestant	79	16,649	1.5
Church of God (Cleveland, Tennessee)	Evangelical Protestant	124	15,169	1.3
Independent, Charismatic Churches	Evangelical Protestant	22	14,930	1.3
International Church of the Foursquare Gospel	Evangelical Protestant	41	11,315	1.0
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	36	10,689	0.9
Church of God (Anderson, Indiana)	Evangelical Protestant	115	9,932	0.9
Mennonite Church USA	Evangelical Protestant	75	9,628	0.8
Apostolic Christian Church of America, Inc.	Evangelical Protestant	18	8,428	0.7
Unitarian Universalist Association of Congregations	Other Theology	40	8,194	0.7
Salvation Army, The	Evangelical Protestant	57	7,209	0.6
Church of the Brethren	Evangelical Protestant	44	6,719	0.6
Christian and Missionary Alliance, The	Evangelical Protestant	60	6,147	0.5
Free Methodist Church of North America	Evangelical Protestant	78	5,576	0.5
Christian Brethren	Evangelical Protestant	45	5,452	0.5
Presbyterian Church in America	Evangelical Protestant	27	5,493	0.5
National Association of Free Will Baptists	Evangelical Protestant	41	5,309	0.5
National Association of Congregational Christian Churches	Mainline Protestant	33	5,175	0.5
Churches of God, General Conference	Evangelical Protestant	29	4,380	0.4
Wesleyan Church, The	Evangelical Protestant	35	4,204	0.4
Armenian Apostolic Church / Catholicossate of Cilicia	Orthodox	3	4,050	0.4
Cumberland Presbyterian Church	Evangelical Protestant	43	3,195	0.3
Old Order Amish Church	Evangelical Protestant	19	2,800	0.2
Association of Free Lutheran Congregations, The	Evangelical Protestant	10	2,579	0.2
Missionary Church, The	Evangelical Protestant	17	2,490	0.2
North American Baptist Conference	Evangelical Protestant	14	2,370	0.2
Baptist Missionary Association of America	Evangelical Protestant	12	2,226	0.2
Conservative Congregational Christian Conference	Evangelical Protestant	7	2,017	0.2
Friends (Quakers)	Mainline Protestant	27	2,012	0.2
Syrian Orthodox Church of Antioch	Orthodox	3	1,900	0.2
Pentecostal Church of God	Evangelical Protestant	20	1,561	0.1
American Association of Lutheran Churches	Evangelical Protestant	5	1,433	0.1
Latvian Evangelical Lutheran Church in America	Mainline Protestant	4	1,320	0.1
Church of God of Prophecy	Evangelical Protestant	28	1,355	0.1
Evangelical Mennonite Church	Evangelical Protestant	8	1,343	0.1
Congregational Christian Churches, Additional (not part of any national CCC body)	Mainline Protestant	3	1,395	0.1
Evangelical Congregational Church, The	Evangelical Protestant	10	1,085	0.1
Advent Christian Church	Evangelical Protestant	9	1,019	0.1
Church of God General Conference	Evangelical Protestant	12	837	0.1
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	4	671	0.1
Evangelical Lutheran Synod	Evangelical Protestant	3	402	0.0
Moravian Church in America--Northern Province	Mainline Protestant	1	447	0.0
Apostolic Christian Churches (Nazarean)	Evangelical Protestant	4	293	0.0
Evangelical Presbyterian Church	Evangelical Protestant	3	377	0.0
International Pentecostal Holiness Church	Evangelical Protestant	6	367	0.0
Church of God (Seventh Day)	Evangelical Protestant	4	325	0.0
Estonian Evangelical Lutheran Church	Mainline Protestant	2	397	0.0
Primitive Baptists Associations	Evangelical Protestant	12	323	0.0
American Carpatho-Russian Orthodox Greek Catholic Church	Orthodox	2	355	0.0
Church of the United Brethren in Christ	Evangelical Protestant	9	293	0.0
Beachy Amish Mennonite Churches	Evangelical Protestant	2	215	0.0
Reformed Episcopal Church	Evangelical Protestant	2	281	0.0
Seventh Day Baptist General Conference, USA and Canada	Evangelical Protestant	1	67	0.0
Primitive Methodist Church in the USA	Evangelical Protestant	1	142	0.0
Church of the Lutheran Confession	Evangelical Protestant	1	65	0.0
Church of the Lutheran Brethren of America	Evangelical Protestant	1	97	0.0
Eastern Pennsylvania Mennonite Church	Evangelical Protestant	3	135	0.0
Old Regular Baptists	Evangelical Protestant	2	69	0.0
Brethren In Christ Church	Evangelical Protestant	2	71	0.0
Evangelical Methodist Church	Evangelical Protestant	3	171	0.0
Christ Catholic Church	Evangelical Protestant	2	17	0.0
Fire Baptized Holiness Church, (Wesleyan), The	Evangelical Protestant	1	21	0.0
Mennonite Brethren Churches, U.S. Conference of	Evangelical Protestant	1	25	0.0
Netherlands Reformed Congregations	Evangelical Protestant	1	16	0.0
Allegheny Wesleyan Methodist Connection	Evangelical Protestant	1	19	0.0
United Baptists	Evangelical Protestant	1	37	0.0
Albanian Orthodox Diocese of America	Orthodox	1	n.a.	n.a.
Byelorussion Council Of Orthodox Churches In North America	Orthodox	1	n.a.	n.a.
Church of Christ, Scientist	Other Theology	104	n.a.	n.a.
Orthodox Church in America: Territorial Dioceses	Orthodox	13	n.a.	n.a.
Greek Orthodox Archdiocese of America	Orthodox	33	n.a.	n.a.
Open Bible Standard Churches, Inc.	Evangelical Protestant	18	n.a.	n.a.
Ukrainian Orthodox Church of the USA	Orthodox	2	n.a.	n.a.
Conservative Baptist Association of America	Evangelical Protestant	35	n.a.	n.a.
Independent Fundamental Churches of America	Evangelical Protestant	68	n.a.	n.a.
Orthodox Church in America: Romanian Orthodox Episcopate of America	Orthodox	2	n.a.	n.a.
	*Totals (Unadjusted)^:**	9,799	6,848,422

The population of these counties (or equivalents) in 1990 was 11,430,602. The adherent totals of the religious groups listed above (6,848,422) include 59.9% of the total population in 1990.

Source

The 1990 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include statistics for 132 religious groups, including number of churches and adherents. Martin B. Bradley, Norman M. Green, Jr., Dale E. Jones, Mac Lynn, and Lou McNeil supervised the collection. These data originally appeared in Churches and Church Membership in the United States, 1990, published by the Glenmary Research Center.

[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 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.