Illinois

Religious Traditions, 2010

1,649,402	220,435	933,690	76,138	3,648,907	566,260	5,735,800
Evangelical Protestant	Black Protestant	Mainline Protestant	Orthodox	Catholic	Other	Unclaimed

Congregational adherents include all full members, their children, and others who regularly attend services. The 2010 reports contain incomplete counts of congregations and adherents belonging to the eight largest historically African-American denominations. These denominations are not included in the 2000 reports and are largely missing from the 1990 and 1980 reports.
[More information on the data sources]

Reports

Religious Bodies	Tradition	Family	Congregations	Adherents	Adherence Rate^†
Non-denominational	Evangelical Protestant	----	1,443	533,464	41.6
United Methodist Church, The	Mainline Protestant	Methodist/Pietist	1,245	314,461	24.5
Catholic Church	Catholic	Catholicism	1,082	3,648,907	284.4
Southern Baptist Convention	Evangelical Protestant	Baptist	1,059	283,519	22.1
Lutheran Church--Missouri Synod	Evangelical Protestant	Lutheran	503	243,192	19.0
Evangelical Lutheran Church in America	Mainline Protestant	Lutheran	497	222,698	17.4
Christian Churches and Churches of Christ	Evangelical Protestant	Baptist	482	131,926	10.3
Presbyterian Church (U.S.A.)	Mainline Protestant	Presbyterian-Reformed	422	101,312	7.9
United Church of Christ	Mainline Protestant	Presbyterian-Reformed	351	124,398	9.7
Assemblies of God	Evangelical Protestant	Pentecostal	320	119,747	9.3
Churches of Christ	Evangelical Protestant	Baptist	275	26,427	2.1
American Baptist Churches in the USA	Mainline Protestant	Baptist	274	69,456	5.4
Church of the Nazarene	Evangelical Protestant	Holiness	223	34,303	2.7
Jehovah's Witnesses	Other	Adventist	197	---	---
United Pentecostal Church International	Evangelical Protestant	Pentecostal	190	---	---
Episcopal Church	Mainline Protestant	Episcopalianism/Anglicanism	165	42,623	3.3
Church of God in Christ	Black Protestant	Pentecostal	163	31,792	2.5
Seventh-day Adventist Church	Evangelical Protestant	Adventist	158	30,370	2.4
National Baptist Convention, USA, Inc.	Black Protestant	Baptist	155	103,542	8.1
Christian Church (Disciples of Christ)	Mainline Protestant	Baptist	153	41,052	3.2
Church of God (Cleveland, Tennessee)	Evangelical Protestant	Pentecostal	134	16,656	1.3
Church of Jesus Christ of Latter-day Saints, The	Other	Latter-day Saints	128	55,750	4.3
African Methodist Episcopal Church	Black Protestant	Methodist/Pietist	109	23,924	1.9
Evangelical Free Church of America, The	Evangelical Protestant	Methodist/Pietist	108	27,188	2.1
Muslim Estimate	Other	Other Groups	108	359,264	28.0
Church of God (Anderson, Indiana)	Evangelical Protestant	Holiness	100	8,196	0.6
Converge Worldwide/Baptist General Conference	Evangelical Protestant	Baptist	99	17,640	1.4
Evangelical Covenant Church, The	Evangelical Protestant	Methodist/Pietist	78	13,680	1.1
National Missionary Baptist Convention, Inc.	Black Protestant	Baptist	65	19,317	1.5
General Association of Regular Baptist Churches	Evangelical Protestant	Baptist	64	---	---
Orthodox Judaism	Other	Judaism	63	16,710	1.3
Church of Christ, Scientist	Other	Christian Science	59	---	---
Free Methodist Church of North America	Evangelical Protestant	Holiness	57	5,580	0.4
Christian and Missionary Alliance, The	Evangelical Protestant	Holiness	53	7,258	0.6
Community of Christ	Other	Latter-day Saints	53	5,334	0.4
Mennonite Church USA	Evangelical Protestant	European Free-Church	52	7,587	0.6
Salvation Army	Evangelical Protestant	Holiness	51	18,379	1.4
Buddhism, Mahayana	Other	Other Groups	50	21,202	1.7
Independent Fundamental Churches of America	Evangelical Protestant	Ind. Fundamentalist	50	---	---
Amish Groups, undifferentiated*	Evangelical Protestant	European Free-Church	47	6,267	0.5
Christian Reformed Church in North America	Evangelical Protestant	Presbyterian-Reformed	47	16,337	1.3
Presbyterian Church in America	Evangelical Protestant	Presbyterian-Reformed	45	7,293	0.6
Foursquare Gospel, International Church of the	Evangelical Protestant	Pentecostal	43	6,823	0.5
Progressive National Baptist Convention, Inc.	Black Protestant	Baptist	43	15,788	1.2
Reformed Church in America	Mainline Protestant	Presbyterian-Reformed	43	12,753	1.0
Bahá'í	Other	Other Groups	41	5,715	0.4
National Association of Free Will Baptists	Evangelical Protestant	Baptist	41	4,304	0.3
Reform Judaism	Other	Judaism	41	40,803	3.2
Anglican Church in North America	Evangelical Protestant	Episcopalianism/Anglicanism	40	---	---
Full Gospel Baptist Church Fellowship	Black Protestant	Baptist	39	---	---
Church of the Brethren	Evangelical Protestant	European Free-Church	38	4,370	0.3
Wisconsin Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	38	9,143	0.7
Christian Methodist Episcopal Church	Black Protestant	Methodist/Pietist	37	12,269	1.0
Cumberland Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	37	2,724	0.2
Unitarian Universalist Association of Congregations	Other	Liberal	36	8,111	0.6
Greek Orthodox Archdiocese of America	Orthodox	Eastern Liturgical (Orthodox)	35	41,364	3.2
Conservative Baptist Association of America	Evangelical Protestant	Baptist	33	---	---
Hindu, Post Renaissance	Other	Other Groups	30	1,010	0.1
Churches of God, General Conference	Evangelical Protestant	Presbyterian-Reformed	26	4,102	0.3
National Baptist Convention of America, Inc.	Black Protestant	Baptist	26	9,898	0.8
Wesleyan Church, The	Evangelical Protestant	Holiness	25	5,266	0.4
Hindu, Indian-American Hindu Temple Assoc.	Other	Other Groups	24	10,441	0.8
National Association of Congregational Christian Churches	Mainline Protestant	Presbyterian-Reformed	24	3,096	0.2
Unity Churches, Association of	Other	Other Groups	24	---	---
Buddhism, Theravada	Other	Other Groups	23	8,805	0.7
Lutheran Congregations in Mission for Christ	Evangelical Protestant	Lutheran	23	12,415	1.0
Missionary Church, The	Evangelical Protestant	Holiness	23	2,923	0.2
Association of Free Lutheran Congregations	Evangelical Protestant	Lutheran	22	---	---
Vineyard USA	Evangelical Protestant	Pentecostal	22	8,568	0.7
Conservative Judaism	Other	Judaism	21	20,325	1.6
Apostolic Christian Church of America, Inc.	Evangelical Protestant	European Free-Church	19	9,478	0.7
Orthodox Church in America	Orthodox	Eastern Liturgical (Orthodox)	19	4,469	0.3
Pentecostal Church of God	Evangelical Protestant	Pentecostal	19	2,068	0.2
African Methodist Episcopal Zion Church	Black Protestant	Methodist/Pietist	18	3,905	0.3
Church of God of Prophecy	Evangelical Protestant	Pentecostal	18	1,047	0.1
American Baptist Association, The	Evangelical Protestant	Baptist	15	888	0.1
North American Lutheran Church	Evangelical Protestant	Lutheran	15	---	---
Open Bible Standard Churches, Inc.	Evangelical Protestant	Pentecostal	15	1,336	0.1
Calvary Chapel Fellowship Churches	Evangelical Protestant	Pentecostal	14	---	---
Conservative Congregational Christian Conference	Evangelical Protestant	Presbyterian-Reformed	14	2,621	0.2
Fellowship of Evangelical Churches	Evangelical Protestant	European Free-Church	14	3,448	0.3
New Apostolic Church of North America, National Organization of the	Other	Other Groups	14	---	---
Orthodox Presbyterian Church, The	Evangelical Protestant	Presbyterian-Reformed	14	1,144	0.1
Buddhism, Vajrayana	Other	Other Groups	13	1,270	0.1
Friends General Conference *	Mainline Protestant	European Free-Church	13	736	0.1
International Council of Community Churches	Mainline Protestant	Presbyterian-Reformed	13	---	---
Serbian Orthodox Church in North America	Orthodox	Eastern Liturgical (Orthodox)	13	9,284	0.7
Korean Presbyterian Church in America	Evangelical Protestant	Presbyterian-Reformed	12	---	---
North American Baptist Conference	Evangelical Protestant	Baptist	12	1,787	0.1
Church of God General Conference	Evangelical Protestant	Adventist	11	609	0.0
Christian Brethren	Evangelical Protestant	Ind. Fundamentalist	10	---	---
Evangelical Congregational Church, The	Evangelical Protestant	Methodist/Pietist	10	672	0.1
New Testament Association of Independent Baptist Churches	Evangelical Protestant	Baptist	9	---	---
Reformed Baptist Churches	Evangelical Protestant	Baptist	9	---	---
Hindu, Traditional Temples	Other	Other Groups	8	8,300	0.6
Korean Presbyterian Church Abroad	Evangelical Protestant	Presbyterian-Reformed	8	---	---
National Spiritualist Association of Churches	Other	Spiritualist	8	---	---
Antiochian Orthodox Christian Archdiocese of North America, The	Orthodox	Eastern Liturgical (Orthodox)	7	4,521	0.4
Church of God (Seventh Day)	Evangelical Protestant	Adventist	7	---	---
Evangelical Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	7	2,294	0.2
Korean-American Presbyterian Church	Evangelical Protestant	Presbyterian-Reformed	7	---	---
Polish National Catholic Church	Catholic	Catholicism	7	---	---
Church of Christ (Holiness), U.S.A	Evangelical Protestant	Holiness	6	---	---
United Holy Church of America, Inc.	Black Protestant	Pentecostal	6	---	---
United Pentecostal Council of the Assemblies of God	Evangelical Protestant	Pentecostal	6	---	---
Armenian Church of North America (Catholicosate of Etchmiadzin)	Orthodox	Eastern Liturgical (Orthodox)	5	2,850	0.2
Church of Our Lord Jesus Christ of the Apostolic Faith, Inc.	Black Protestant	Pentecostal	5	---	---
Grace Gospel Fellowship	Evangelical Protestant	Ind. Fundamentalist	5	---	---
Hindu, Renaissance	Other	Other Groups	5	661	0.1
International Pentecostal Holiness Church	Evangelical Protestant	Pentecostal	5	198	0.0
Ukrainian Orthodox Church of the USA	Orthodox	Eastern Liturgical (Orthodox)	5	2,290	0.2
Union of Messianic Jewish Congregations	Other	Judaism	5	---	---
Friends United Meeting *	Mainline Protestant	European Free-Church	4	324	0.0
Independent Baptist Fellowship International	Evangelical Protestant	Baptist	4	---	---
International Churches of Christ	Evangelical Protestant	Baptist	4	2,648	0.2
Malankara Orthodox Syrian Church	Orthodox	Eastern Liturgical (Orthodox)	4	720	0.1
Metropolitan Community Churches, Universal Fellowship of	Mainline Protestant	Other Groups	4	208	0.0
Sikh	Other	Other Groups	4	---	---
United Reformed Churches in North America	Evangelical Protestant	Presbyterian-Reformed	4	---	---
American Carpatho-Russian Orthodox Diocese	Orthodox	Eastern Liturgical (Orthodox)	3	593	0.0
Armenian Apostolic Church of America (Catholicosate of Cilicia)	Orthodox	Eastern Liturgical (Orthodox)	3	2,000	0.2
Brethren Church, The (Ashland, Ohio)	Evangelical Protestant	European Free-Church	3	287	0.0
Brethren In Christ Church	Evangelical Protestant	European Free-Church	3	---	---
Church of the United Brethren in Christ	Evangelical Protestant	Methodist/Pietist	3	59	0.0
Coptic Orthodox Church	Orthodox	Eastern Liturgical (Orthodox)	3	2,600	0.2
Evangelical Church, The	Evangelical Protestant	Holiness	3	---	---
International Fellowship of Bible Churches	Evangelical Protestant	----	3	---	---
Malankara Archdiocese of the Syrian Orthodox Church in North America	Orthodox	Eastern Liturgical (Orthodox)	3	522	0.0
Midwest Beachy Amish Mennonite*	Evangelical Protestant	European Free-Church	3	391	0.0
Pentecostal Fire-Baptized Holiness Church	Evangelical Protestant	Pentecostal	3	---	---
Protestant Reformed Churches in America	Evangelical Protestant	Presbyterian-Reformed	3	747	0.1
Russian Orthodox Church Outside of Russia	Orthodox	Eastern Liturgical (Orthodox)	3	595	0.0
Unaffiliated Conservative Amish Mennonite Church*	Evangelical Protestant	European Free-Church	3	180	0.0
Alliance of Baptists	Mainline Protestant	Baptist	2	---	---
Association of Reformed Baptist Churches of America	Evangelical Protestant	Baptist	2	---	---
Beachy Amish Mennonite Churches *	Evangelical Protestant	European Free-Church	2	360	0.0
Bulgarian Eastern Orthodox Diocese of the USA, Canada and Australia	Orthodox	Eastern Liturgical (Orthodox)	2	425	0.0
Church of the Lutheran Confession	Evangelical Protestant	Lutheran	2	---	---
Communion of Reformed Evangelical Churches	Evangelical Protestant	Presbyterian-Reformed	2	---	---
Cumberland Presbyterian Church in America	Black Protestant	Presbyterian-Reformed	2	---	---
Elim Fellowship	Evangelical Protestant	Pentecostal	2	---	---
Eritrean Orthodox	Orthodox	Eastern Liturgical (Orthodox)	2	610	0.0
Evangelical Association of Reformed, and Congregational Christian Churches	Evangelical Protestant	Presbyterian-Reformed	2	---	---
Evangelical Methodist Church	Evangelical Protestant	Methodist/Pietist	2	---	---
Friends General Conference and Friends United Meeting, dually aligned meetings*	Mainline Protestant	European Free-Church	2	299	0.0
Macedonian Orthodox Church: American Diocese	Orthodox	Eastern Liturgical (Orthodox)	2	1,400	0.1
Reconstructionist Judaism	Other	Judaism	2	2,330	0.2
Reformed Presbyterian Church of North America	Evangelical Protestant	Presbyterian-Reformed	2	79	0.0
Romanian Orthodox Archdiocese in Americas	Orthodox	Eastern Liturgical (Orthodox)	2	740	0.1
Seventh Day Baptist General Conference, USA and Canada	Evangelical Protestant	Baptist	2	70	0.0
Swedenborgian Church	Other	Spiritualist	2	---	---
Syriac Orthodox Church of Antioch	Orthodox	Eastern Liturgical (Orthodox)	2	560	0.0
Unaffiliated Friends Meetings*	Mainline Protestant	European Free-Church	2	---	---
Albanian Orthodox Diocese of America	Orthodox	Eastern Liturgical (Orthodox)	1	350	0.0
American Association of Lutheran Churches	Evangelical Protestant	Lutheran	1	---	---
Apostolic Faith Mission of Portland, OR	Evangelical Protestant	Pentecostal	1	43	0.0
Assemblies of God International Fellowship	Evangelical Protestant	Pentecostal	1	---	---
Berea Amish Mennonite*	Evangelical Protestant	European Free-Church	1	197	0.0
Church of God in Christ, Mennonite	Evangelical Protestant	European Free-Church	1	95	0.0
Church of the Lutheran Brethren of America	Evangelical Protestant	Lutheran	1	260	0.0
Conservative Mennonite Conference	Evangelical Protestant	European Free-Church	1	142	0.0
Ethiopian Orthodox	Orthodox	Eastern Liturgical (Orthodox)	1	---	---
Evangelical Friends Church International*	Evangelical Protestant	European Free-Church	1	21	0.0
Evangelical Lutheran Synod	Evangelical Protestant	Lutheran	1	166	0.0
Fundamental Baptist Fellowship	Evangelical Protestant	Baptist	1	---	---
Georgian Orthodox Parishes in the United States	Orthodox	Eastern Liturgical (Orthodox)	1	150	0.0
Holy Orthodox Church in North America	Orthodox	Eastern Liturgical (Orthodox)	1	55	0.0
Hungarian Reformed Churches (Additional)	Mainline Protestant	Presbyterian-Reformed	1	---	---
Jain	Other	Other Groups	1	---	---
Moravian Church in America--Northern Province	Mainline Protestant	Methodist/Pietist	1	274	0.0
Patriarchal Parishes of the Russian Orthodox Church in the USA	Orthodox	Eastern Liturgical (Orthodox)	1	40	0.0
Primitive Methodist Church in the USA	Evangelical Protestant	Methodist/Pietist	1	---	---
Reformed Mennonite Church	Evangelical Protestant	European Free-Church	1	42	0.0
Tampico Amish Mennonite*	Evangelical Protestant	European Free-Church	1	378	0.0
Tao	Other	Other Groups	1	---	---
Zoroastrian	Other	Other Groups	1	229	0.0
		Totals:	12,453	7,094,832

The population of Illinois was 12,830,632 in 2010; in 2000 it was 12,419,293. The total population changed 3.3%. The adherent totals of the religious groups listed above (7,094,832) included 55.3% of the total population in 2010.

^* In an effort to better match the ASARB standards for adherents, a few religious bodies changed the way their adherents were reported in 2010, including the Catholic Church, Amish groups, Friends groups, Jewish groups, the Church of Jesus Christ of Latter-day Saints, Non-denominational Christian Churches, and the United Methodist Church. This change does not affect any of the data in the newly released 2010 U.S. Religion Census: Religious Congregations & Membership Study. In fact, the data for these groups are now more comparable to that of other bodies than it was in previous decadal reports.

However, the change in methodology can distort assessments on growth or decline between 2000 and 2010 for each of these groups. County-level 2000 data using the new methodology are not readily available. ASARB staff has adjusted some 2000 county-level adherent statistics to allow for a more accurate picture on growth or decline. The revised maps and charts are now available on-line at www.usreligioncensus.org for those who are interested in these trends.

Source

2010 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include statistics for 236 religious groups, providing information on the number of their congregations and adherents within each state and county in the United States. Clifford Grammich, Kirk Hadaway, Richard Houseal, Dale E. Jones, Alexei Krindatch, Richie Stanley and Richard H. Taylor supervised the collection. These data originally appeared in 2010 U.S. Religion Census: Religious Congregations & Membership Study, published by the Association of Statisticians of American Religious Bodies (ASARB). [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 2010 the Episcopal Church had an adherence rate of 7.6 in Autauga County, Alabama. This means that about 8 out of every 1,000 people in Autauga County were Episcopalian.