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
Jewish Estimate	Other Theology	+93	+223,969	487.0%
Southern Baptist Convention	Evangelical Protestant	+93	+41,526	16.0%
Evangelical Free Church of America, The	Evangelical Protestant	+59	+17,752	152.0%
Church of Jesus Christ of Latter-day Saints, The	Other Theology	+54	+12,249	52.0%
Christian Churches and Churches of Christ	Evangelical Protestant	+52	+23,662	21.0%
Independent, Non-Charismatic Churches	Evangelical Protestant	+47	+50,545	n.a.
Assemblies of God	Evangelical Protestant	+45	+34,231	55.0%
National Association of Free Will Baptists	Evangelical Protestant	+41	+4,351	n.a.
Greek Orthodox Archdiocese of America	Orthodox	+35	+36,801	n.a.
Seventh-day Adventist Church	Evangelical Protestant	+34	+7,470	42.0%
Presbyterian Church in America	Evangelical Protestant	+32	+7,266	557.0%
Wesleyan Church, The	Evangelical Protestant	+28	+6,961	n.a.
International Church of the Foursquare Gospel	Evangelical Protestant	+27	+1,662	18.0%
Churches of God, General Conference	Evangelical Protestant	+27	+4,413	n.a.
Christian and Missionary Alliance, The	Evangelical Protestant	+25	+3,022	94.0%
Pentecostal Church of God	Evangelical Protestant	+25	+2,460	n.a.
Old Order Amish Church	Evangelical Protestant	+22	+417	22.0%
Church of God of Prophecy	Evangelical Protestant	+21	+1,118	n.a.
Apostolic Christian Church of America, Inc.	Evangelical Protestant	+19	+9,812	n.a.
Independent, Charismatic Churches	Evangelical Protestant	+17	+11,398	n.a.
Lutheran Church--Missouri Synod	Evangelical Protestant	+15	-35,417	-11.0%
Association of Free Lutheran Congregations, The	Evangelical Protestant	+14	+3,807	2505.0%
American Baptist Association, The	Evangelical Protestant	+11	+346	43.0%
Orthodox Church in America: Territorial Dioceses	Orthodox	+11	+3,428	n.a.
Baptist General Conference	Evangelical Protestant	+10	+3,052	19.0%
Evangelical Covenant Church, The	Evangelical Protestant	+7	+2,677	18.0%
Evangelical Mennonite Church	Evangelical Protestant	+6	+1,322	118.0%
Orthodox Presbyterian Church, The	Evangelical Protestant	+5	+440	120.0%
Evangelical Presbyterian Church	Evangelical Protestant	+4	+694	n.a.
Conservative Congregational Christian Conference	Evangelical Protestant	+4	+772	56.0%
Apostolic Catholic Assyrian Church of the East, North American Dioceses	Orthodox	+4	+22,785	n.a.
Christian Reformed Church in North America	Evangelical Protestant	+4	+2,233	13.0%
Universal Fellowship of Metropolitan Community Churches	Mainline Protestant	+4	-441	-55.0%
Salvation Army, The	Evangelical Protestant	+4	+452	2.0%
Baptist Missionary Association of America	Evangelical Protestant	+3	+326	37.0%
Beachy Amish Mennonite Churches	Evangelical Protestant	+3	+185	102.0%
Ukrainian Orthodox Church of the USA	Orthodox	+3	+1,388	408.0%
Church of the Brethren	Evangelical Protestant	+3	-1,030	-14.0%
Eastern Pennsylvania Mennonite Church	Evangelical Protestant	+3	+286	n.a.
Protestant Reformed Churches in America	Evangelical Protestant	+2	+219	50.0%
American Carpatho-Russian Orthodox Greek Catholic Church	Orthodox	+2	+414	n.a.
International Pentecostal Holiness Church	Evangelical Protestant	+2	+111	99.0%
Church of God General Conference	Evangelical Protestant	+2	+33	4.0%
Orthodox Church in America: Romanian Orthodox Episcopate of America	Orthodox	+2	+3,000	n.a.
Albanian Orthodox Diocese of America	Orthodox	+1	+270	n.a.
Allegheny Wesleyan Methodist Connection	Evangelical Protestant	+1	+18	n.a.
Separate Baptists in Christ	Evangelical Protestant	+1	+1	0.0%
Netherlands Reformed Congregations	Evangelical Protestant	+1	+31	n.a.
Mennonite Brethren Churches, U.S. Conference of	Evangelical Protestant	0	-35	-71.0%
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	0	-287	-36.0%
Brethren In Christ Church	Evangelical Protestant	0	-10	-14.0%
Armenian Apostolic Church / Catholicossate of Cilicia	Orthodox	0	+844	146.0%
Moravian Church in America--Northern Province	Mainline Protestant	0	-170	-36.0%
Primitive Methodist Church in the USA	Evangelical Protestant	0	-133	-69.0%
Apostolic Christian Churches (Nazarene)	Evangelical Protestant	0	+267	92.0%
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	0	-369	-4.0%
National Association of Congregational Christian Churches	Mainline Protestant	0	+65	1.0%
Friends (Quakers)	Mainline Protestant	0	+17	1.0%
Syrian Orthodox Church of Antioch	Orthodox	-1	-575	-68.0%
Reformed Church in America	Mainline Protestant	-1	-3,352	-16.0%
American Baptist Churches in the USA	Mainline Protestant	-2	-16,653	-16.0%
Unitarian Universalist Association of Congregations	Other Theology	-2	-1,983	-22.0%
Cumberland Presbyterian Church	Evangelical Protestant	-2	+90	3.0%
North American Baptist Conference	Evangelical Protestant	-3	-627	-24.0%
Missionary Church, The	Evangelical Protestant	-3	+956	43.0%
Conservative Baptist Association of America	Evangelical Protestant	-4	-2,414	-24.0%
Episcopal Church	Mainline Protestant	-6	-21,266	-29.0%
Free Methodist Church of North America	Evangelical Protestant	-7	-11,417	-66.0%
Church of God (Anderson, Indiana)	Evangelical Protestant	-9	-16,615	-62.0%
Church of the Nazarene	Evangelical Protestant	-10	-10,627	-22.0%
Churches of Christ	Evangelical Protestant	-12	-2,299	-7.0%
Church of God (Cleveland, Tennessee)	Evangelical Protestant	-12	+5,905	48.0%
Evangelical Lutheran Church in America	Mainline Protestant	-20	-39,828	-12.0%
United Church of Christ	Mainline Protestant	-33	-24,728	-13.0%
Christian Church (Disciples of Christ)	Mainline Protestant	-34	-16,841	-23.0%
Presbyterian Church (U.S.A.)	Mainline Protestant	-44	-60,062	-31.0%
Catholic Church	Catholic	-109	+274,228	8.0%
United Methodist Church, The	Mainline Protestant	-146	-140,224	-28.0%
	Totals:	468	+424,344	+6.8%

The population of these 102 counties (or equivalents) in 1980 was 11,426,518; in 2000 it was 12,419,293. The total population changed 8.6%. The adherent totals for 1980 (6,250,249) represent 54.7% of the 1980 population. The adherent totals for 2000 (6,867,100) include 55.3% of the 2000 population. There is sufficient data for 78 groups to calculate 1980-2000 change. These 78 groups had 6,219,118 adherents in 1980 and 6,643,462 adherents in 2000, for a change of 6.8%

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 1980 data were collected by the Glenmary Research Center and include statistics for 111 Judeo-Christian church bodies, including number of churches and adherents. Bernard Quinn, Herman Anderson, Martin Bradley, Paul Goetting and Peggy Shriver supervised the collection. These data originally appeared in Churches and Church Membership in the United States, 1980, published by the Glenmary Research Center.

[More information on these data sources]