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	% Change
Catholic Church	Catholic	+36	+263,900	7.3%
Assemblies of God	Evangelical Protestant	-2	+16,237	20.1%
Salvation Army, The	Evangelical Protestant	-1	+15,556	215.8%
Christian Churches and Churches of Christ	Evangelical Protestant	+21	+15,164	12.7%
Southern Baptist Convention	Evangelical Protestant	+64	+13,194	4.5%
Evangelical Free Church of America, The	Evangelical Protestant	+38	+9,801	50.0%
Church of Jesus Christ of Latter-day Saints, The	Other Theology	+31	+5,507	18.1%
Church of God (Cleveland, Tennessee)	Evangelical Protestant	-1	+3,077	20.3%
Presbyterian Church in America	Evangelical Protestant	+17	+3,077	56.0%
Wesleyan Church, The	Evangelical Protestant	-7	+2,757	65.6%
Baptist General Conference	Evangelical Protestant	-1	+2,568	15.4%
Independent, Non-Charismatic Churches	Evangelical Protestant	+7	+2,490	5.2%
Christian Reformed Church in North America	Evangelical Protestant	-3	+1,476	8.5%
Apostolic Christian Church of America, Inc.	Evangelical Protestant	+1	+1,384	16.4%
Association of Free Lutheran Congregations, The	Evangelical Protestant	+5	+1,380	53.5%
Evangelical Mennonite Church	Evangelical Protestant	+4	+1,099	81.8%
Pentecostal Church of God	Evangelical Protestant	+5	+899	57.6%
Jewish Estimate	Other Theology	-23	+812	0.3%
Missionary Church, The	Evangelical Protestant	-4	+693	27.8%
Seventh-day Adventist Church	Evangelical Protestant	+5	+604	2.5%
Friends (Quakers)	Mainline Protestant	-1	+346	17.2%
Evangelical Presbyterian Church	Evangelical Protestant	+1	+317	84.1%
Apostolic Christian Churches (Nazarene)	Evangelical Protestant	0	+265	90.4%
Free Methodist Church of North America	Evangelical Protestant	-9	+242	4.3%
Beachy Amish Mennonite Churches	Evangelical Protestant	+2	+152	70.7%
Eastern Pennsylvania Mennonite Church	Evangelical Protestant	0	+151	111.9%
Conservative Congregational Christian Conference	Evangelical Protestant	+3	+129	6.4%
Church of God (Anderson, Indiana)	Evangelical Protestant	-10	+96	1.0%
Christian and Missionary Alliance, The	Evangelical Protestant	-6	+75	1.2%
American Carpatho-Russian Orthodox Greek Catholic Church	Orthodox	0	+59	16.6%
Churches of God, General Conference	Evangelical Protestant	-2	+33	0.8%
Netherlands Reformed Congregations	Evangelical Protestant	0	+15	93.8%
Allegheny Wesleyan Methodist Connection	Evangelical Protestant	0	-1	-5.3%
Brethren In Christ Church	Evangelical Protestant	-1	-8	-11.3%
Mennonite Brethren Churches, U.S. Conference of	Evangelical Protestant	0	-11	-44.0%
Church of God General Conference	Evangelical Protestant	+1	-45	-5.4%
Primitive Methodist Church in the USA	Evangelical Protestant	0	-81	-57.0%
International Pentecostal Holiness Church	Evangelical Protestant	0	-144	-39.2%
Moravian Church in America--Northern Province	Mainline Protestant	0	-149	-33.3%
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	-1	-150	-22.4%
National Association of Congregational Christian Churches	Mainline Protestant	-4	-196	-3.8%
Cumberland Presbyterian Church	Evangelical Protestant	-3	-236	-7.4%
Church of God of Prophecy	Evangelical Protestant	-7	-237	-17.5%
North American Baptist Conference	Evangelical Protestant	-3	-358	-15.1%
Old Order Amish Church	Evangelical Protestant	+15	-494	-17.6%
Church of the Brethren	Evangelical Protestant	+1	-513	-7.6%
International Church of the Foursquare Gospel	Evangelical Protestant	+15	-530	-4.7%
Unitarian Universalist Association of Congregations	Other Theology	-4	-950	-11.6%
National Association of Free Will Baptists	Evangelical Protestant	0	-958	-18.0%
Baptist Missionary Association of America	Evangelical Protestant	+2	-1,025	-46.0%
Mennonite Church USA	Evangelical Protestant	-23	-1,039	-10.8%
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	-3	-1,126	-10.5%
Syrian Orthodox Church of Antioch	Orthodox	-2	-1,630	-85.8%
Episcopal Church	Mainline Protestant	+16	-2,173	-4.0%
Reformed Church in America	Mainline Protestant	-3	-2,260	-11.2%
Armenian Apostolic Church / Catholicossate of Cilicia	Orthodox	0	-2,629	-64.9%
Independent, Charismatic Churches	Evangelical Protestant	-5	-3,532	-23.7%
Church of the Nazarene	Evangelical Protestant	-21	-4,006	-9.5%
Churches of Christ	Evangelical Protestant	-5	-4,039	-12.1%
Apostolic Catholic Assyrian Church of the East, North American Dioceses	Orthodox	+1	-4,397	-16.2%
American Baptist Churches in the USA	Mainline Protestant	0	-8,478	-8.8%
Christian Church (Disciples of Christ)	Mainline Protestant	-32	-8,908	-13.6%
Evangelical Lutheran Church in America	Mainline Protestant	-15	-17,244	-5.8%
Lutheran Church--Missouri Synod	Evangelical Protestant	+2	-17,812	-6.0%
United Church of Christ	Mainline Protestant	-21	-18,786	-10.1%
Presbyterian Church (U.S.A.)	Mainline Protestant	-21	-24,343	-15.4%
United Methodist Church, The	Mainline Protestant	-92	-75,499	-17.1%
Albanian Orthodox Diocese of America	Orthodox	0	n.a.	n.a.
Conservative Baptist Association of America	Evangelical Protestant	-2	n.a.	n.a.
Greek Orthodox Archdiocese of America	Orthodox	+2	n.a.	n.a.
Orthodox Church in America: Romanian Orthodox Episcopate of America	Orthodox	0	n.a.	n.a.
Orthodox Church in America: Territorial Dioceses	Orthodox	-2	n.a.	n.a.
Ukrainian Orthodox Church of the USA	Orthodox	+2	n.a.	n.a.
	Totals:	-43	+159,568	+2.5%

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 adherent totals for 1990 (6,848,422) represent 59.9% of the 1990 population. The adherent totals for 2000 (6,867,100) include 55.3% of the 2000 population. There is sufficient data for 67 groups to calculate 1990-2000 change. These 67 groups had 6,418,388 adherents in 1990 and 6,577,956 adherents in 2000, for a change of 2.5%

Sources

The 2000 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and includes statistics for 149 religious groups, including number of churches and adherents. Dale E. Jones, Sherri Doty, Clifford Grammich, James E. Horsch, Richard Houseal, Mac Lynn, John P. Marcum, Kenneth M. Sanchagrin and Richard H. Taylor supervised the collection. These data originally appeared in Religious Congregations & Membership in the United States, 2000, published by the Glenmary Research Center.

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 these data sources]