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	1,234	3,600,705	315.1
United Methodist Church, The	Mainline Protestant	1,534	505,406	44.2
Evangelical Lutheran Church in America	Mainline Protestant	573	319,552	28.0
Lutheran Church--Missouri Synod	Evangelical Protestant	506	313,425	27.4
Southern Baptist Convention	Evangelical Protestant	888	264,312	23.1
Presbyterian Church (U.S.A.)	Mainline Protestant	497	194,039	17.0
United Church of Christ	Mainline Protestant	423	191,500	16.8
Christian Churches and Churches of Christ	Evangelical Protestant	467	110,663	9.7
American Baptist Churches in the USA	Mainline Protestant	298	104,615	9.2
Episcopal Church	Mainline Protestant	206	73,844	6.5
Christian Church (Disciples of Christ)	Mainline Protestant	204	73,479	6.4
Assemblies of God	Evangelical Protestant	292	62,662	5.5
Church of the Nazarene	Evangelical Protestant	257	48,677	4.3
Jewish Estimate	Other Theology	68	46,031	4.0
Churches of Christ	Evangelical Protestant	305	31,594	2.8
Church of God (Anderson, Indiana)	Evangelical Protestant	114	26,643	2.3
Church of Jesus Christ of Latter-day Saints, The	Other Theology	62	23,610	2.1
Salvation Army, The	Evangelical Protestant	52	22,313	2.0
Reformed Church in America	Mainline Protestant	54	21,288	1.9
African Methodist Episcopal Zion Church	Evangelical Protestant	14	18,426	1.6
Seventh-day Adventist Church	Evangelical Protestant	100	17,576	1.5
Free Methodist Church of North America	Evangelical Protestant	76	17,235	1.5
Christian Reformed Church in North America	Evangelical Protestant	44	16,633	1.5
Baptist General Conference	Evangelical Protestant	68	16,165	1.4
Evangelical Covenant Church, The	Evangelical Protestant	62	15,082	1.3
Church of God (Cleveland, Tennessee)	Evangelical Protestant	135	12,341	1.1
Evangelical Free Church of America, The	Evangelical Protestant	68	11,650	1.0
Conservative Baptist Association of America	Evangelical Protestant	37	9,989	0.9
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	33	9,932	0.9
Unitarian Universalist Association of Congregations	Other Theology	38	9,227	0.8
International Church of the Foursquare Gospel	Evangelical Protestant	29	9,123	0.8
Church of the Brethren	Evangelical Protestant	42	7,236	0.6
National Association of Congregational Christian Churches	Mainline Protestant	29	4,914	0.4
Christian Brethren	Evangelical Protestant	39	4,055	0.4
Open Bible Standard Churches, Inc.	Evangelical Protestant	21	3,381	0.3
Christian and Missionary Alliance, The	Evangelical Protestant	29	3,200	0.3
Cumberland Presbyterian Church	Evangelical Protestant	42	2,869	0.3
North American Baptist Conference	Evangelical Protestant	14	2,639	0.2
Friends (Quakers)	Mainline Protestant	26	2,341	0.2
Missionary Church, The	Evangelical Protestant	16	2,227	0.2
Old Order Amish Church	Evangelical Protestant	12	1,889	0.2
Conservative Congregational Christian Conference	Evangelical Protestant	6	1,374	0.1
Evangelical Congregational Church, The	Evangelical Protestant	12	1,349	0.1
Presbyterian Church in America	Evangelical Protestant	12	1,304	0.1
Latvian Evangelical Lutheran Church in America	Mainline Protestant	3	1,219	0.1
Evangelical Mennonite Church	Evangelical Protestant	6	1,120	0.1
Baptist Missionary Association of America	Evangelical Protestant	11	875	0.1
Syrian Orthodox Church of Antioch	Orthodox	2	845	0.1
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	3	808	0.1
Universal Fellowship of Metropolitan Community Churches	Mainline Protestant	2	800	0.1
American Baptist Association, The	Evangelical Protestant	8	800	0.1
Church of God General Conference	Evangelical Protestant	11	759	0.1
Estonian Evangelical Lutheran Church	Mainline Protestant	3	742	0.1
Advent Christian Church	Evangelical Protestant	7	617	0.1
Armenian Apostolic Church / Catholicossate of Cilicia	Orthodox	3	577	0.1
Separate Baptists in Christ	Evangelical Protestant	7	566	0.1
Evangelical Lutheran Synod	Evangelical Protestant	3	534	0.1
Moravian Church in America--Northern Province	Mainline Protestant	1	468	0.0
Protestant Reformed Churches in America	Evangelical Protestant	1	435	0.0
Reformed Episcopal Church	Evangelical Protestant	2	377	0.0
Orthodox Presbyterian Church, The	Evangelical Protestant	3	368	0.0
Ukrainian Orthodox Church of the USA	Orthodox	1	340	0.0
Apostolic Christian Churches (Nazarene)	Evangelical Protestant	4	291	0.0
Church of the Lutheran Brethren of America	Evangelical Protestant	1	208	0.0
Primitive Methodist Church in the USA	Evangelical Protestant	1	194	0.0
Beachy Amish Mennonite Churches	Evangelical Protestant	1	182	0.0
Association of Free Lutheran Congregations, The	Evangelical Protestant	1	152	0.0
Evangelical Methodist Church	Evangelical Protestant	2	122	0.0
International Pentecostal Holiness Church	Evangelical Protestant	4	112	0.0
Brethren In Christ Church	Evangelical Protestant	1	73	0.0
Mennonite Brethren Churches, U.S. Conference of	Evangelical Protestant	1	49	0.0
Church of God (Seventh Day)	Evangelical Protestant	2	47	0.0
Seventh Day Baptist General Conference, USA and Canada	Evangelical Protestant	1	45	0.0
Fire Baptized Holiness Church, (Wesleyan), The	Evangelical Protestant	1	9	0.0
	*Totals (Unadjusted)^:**	9,135	6,250,249

The population of these counties (or equivalent) in 1980 was 11,426,518. The adherent totals of the religious groups listed above (6,250,249) include 54.7% of the total population in 1980.

Source

The 1980 data were collected by the Glenmary Research Center and includes statistics for 111 Judeo-Christian church bodies, including number of churches and adherents. These data originally appeared in Churches and Church Membership in the United States, 1980, published by the Glenmary Research Center.

^†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.