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