State Membership Report
 Maps and Reports > Select State > State Report
Search Maps & Reports:

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 % Change
African Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist --- --- ---
Albanian Orthodox Diocese of America Orthodox Eastern Liturgical (Orthodox) +0 +80 +29.6%
Alliance of Baptists Mainline Protestant Baptist --- --- ---
American Association of Lutheran Churches Evangelical Protestant Lutheran --- --- ---
American Baptist Association, The Evangelical Protestant Baptist -4 -258 -22.5%
American Baptist Churches in the USA Mainline Protestant Baptist -22 -18,506 -21.0%
American Carpatho-Russian Orthodox Diocese Orthodox Eastern Liturgical (Orthodox) +1 +179 +43.2%
Amish Groups, undifferentiated* Evangelical Protestant European Free-Church --- --- ---
Anglican Church in North America Evangelical Protestant Episcopalianism/Anglicanism --- --- ---
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) +2 +2,631 +139.2%
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church +0 -334 -3.4%
Apostolic Faith Mission of Portland, OR Evangelical Protestant Pentecostal --- --- ---
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) +0 +579 +40.7%
Armenian Church of North America (Catholicosate of Etchmiadzin) Orthodox Eastern Liturgical (Orthodox) +0 -1,446 -33.7%
Assemblies of God Evangelical Protestant Pentecostal -17 +22,854 +23.6%
Assemblies of God International Fellowship Evangelical Protestant Pentecostal --- --- ---
Association of Free Lutheran Congregations Evangelical Protestant Lutheran +7 --- ---
Association of Reformed Baptist Churches of America Evangelical Protestant Baptist --- --- ---
Bahá'í Other Other Groups -4 +388 +7.3%
Beachy Amish Mennonite Churches* Evangelical Protestant European Free-Church -2 -7 -1.9%
Berea Amish Mennonite* Evangelical Protestant European Free-Church --- --- ---
Brethren Church, The (Ashland, Ohio) Evangelical Protestant European Free-Church +0 -234 -44.9%
Brethren In Christ Church Evangelical Protestant European Free-Church +2 --- ---
Bulgarian Eastern Orthodox Diocese of the USA, Canada and Australia Orthodox Eastern Liturgical (Orthodox) +0 -835 -66.3%
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal +5 --- ---
Catholic Church Catholic Catholicism -43 -226,026 -5.8%
Christian and Missionary Alliance, The Evangelical Protestant Holiness -1 +1,036 +16.7%
Christian Brethren Evangelical Protestant Ind. Fundamentalist --- --- ---
Christian Church (Disciples of Christ) Mainline Protestant Baptist -17 -15,586 -27.5%
Christian Churches and Churches of Christ Evangelical Protestant Baptist -37 -2,399 -1.8%
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed -1 -2,529 -13.4%
Church of Christ (Holiness), U.S.A Evangelical Protestant Holiness --- --- ---
Church of Christ, Scientist Other Christian Science --- --- ---
Church of God (Anderson, Indiana) Evangelical Protestant Holiness -5 -1,832 -18.3%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal +11 -1,590 -8.7%
Church of God (Seventh Day) Evangelical Protestant Adventist --- --- ---
Church of God General Conference Evangelical Protestant Adventist -2 -183 -23.1%
Church of God in Christ Black Protestant Pentecostal --- --- ---
Church of God in Christ, Mennonite Evangelical Protestant European Free-Church +0 +65 +216.7%
Church of God of Prophecy Evangelical Protestant Pentecostal -3 -71 -6.4%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +12 +19,891 +55.5%
Church of Our Lord Jesus Christ of the Apostolic Faith, Inc. Black Protestant Pentecostal --- --- ---
Church of the Brethren Evangelical Protestant European Free-Church -7 -1,836 -29.6%
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran --- --- ---
Church of the Lutheran Confession Evangelical Protestant Lutheran --- --- ---
Church of the Nazarene Evangelical Protestant Holiness -24 -3,747 -9.8%
Church of the United Brethren in Christ Evangelical Protestant Methodist/Pietist --- --- ---
Churches of Christ Evangelical Protestant Baptist -18 -2,868 -9.8%
Churches of God, General Conference Evangelical Protestant Presbyterian-Reformed -1 -311 -7.0%
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian-Reformed --- --- ---
Community of Christ Other Latter-day Saints -1 +939 +21.4%
Conservative Baptist Association of America Evangelical Protestant Baptist +0 --- ---
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed +4 +475 +22.1%
Conservative Judaism Other Judaism --- --- ---
Conservative Mennonite Conference Evangelical Protestant European Free-Church -1 -233 -62.1%
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +21 -1,577 -8.2%
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) --- --- ---
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed -3 -235 -7.9%
Cumberland Presbyterian Church in America Black Protestant Presbyterian-Reformed --- --- ---
Elim Fellowship Evangelical Protestant Pentecostal --- --- ---
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -35 -9,955 -18.9%
Eritrean Orthodox Orthodox Eastern Liturgical (Orthodox) --- --- ---
Ethiopian Orthodox Orthodox Eastern Liturgical (Orthodox) --- --- ---
Evangelical Association of Reformed, and Congregational Christian Churches Evangelical Protestant Presbyterian-Reformed --- --- ---
Evangelical Church, The Evangelical Protestant Holiness --- --- ---
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist --- --- ---
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist +9 -4,079 -23.0%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist -19 -2,214 -7.5%
Evangelical Friends Church International* Evangelical Protestant European Free-Church --- --- ---
Evangelical Lutheran Church in America Mainline Protestant Lutheran -56 -57,026 -20.4%
Evangelical Lutheran Synod Evangelical Protestant Lutheran --- --- ---
Evangelical Methodist Church Evangelical Protestant Methodist/Pietist --- --- ---
Evangelical Presbyterian Church Evangelical Protestant Presbyterian-Reformed +3 +1,600 +230.5%
Fellowship of Evangelical Churches Evangelical Protestant European Free-Church +2 +1,006 +41.2%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal -13 -3,962 -36.7%
Free Methodist Church of North America Evangelical Protestant Holiness -12 -238 -4.1%
Friends General Conference and Friends United Meeting, dually aligned meetings* Mainline Protestant European Free-Church --- --- ---
Friends General Conference* Mainline Protestant European Free-Church --- --- ---
Friends United Meeting* Mainline Protestant European Free-Church --- --- ---
Full Gospel Baptist Church Fellowship Black Protestant Baptist --- --- ---
Fundamental Baptist Fellowship Evangelical Protestant Baptist --- --- ---
General Association of Regular Baptist Churches Evangelical Protestant Baptist -5 --- ---
Georgian Orthodox Parishes in the United States Orthodox Eastern Liturgical (Orthodox) --- --- ---
Grace Gospel Fellowship Evangelical Protestant Ind. Fundamentalist --- --- ---
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) +0 +4,563 +12.4%
Holy Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) +0 +37 +205.6%
Hungarian Reformed Churches (Additional) Mainline Protestant Presbyterian-Reformed --- --- ---
Independent Baptist Fellowship International Evangelical Protestant Baptist --- --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist --- --- ---
International Churches of Christ Evangelical Protestant Baptist +0 -2,460 -48.2%
International Council of Community Churches Mainline Protestant Presbyterian-Reformed -4 --- ---
International Fellowship of Bible Churches Evangelical Protestant
----
--- --- ---
International Pentecostal Holiness Church Evangelical Protestant Pentecostal -1 -25 -11.2%
Jain Other Other Groups -1 --- ---
Jehovah's Witnesses Other Adventist --- --- ---
Korean Presbyterian Church Abroad Evangelical Protestant Presbyterian-Reformed --- --- ---
Korean Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed --- --- ---
Korean-American Presbyterian Church Evangelical Protestant Presbyterian-Reformed --- --- ---
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran -18 -34,816 -12.5%
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran --- --- ---
Macedonian Orthodox Church: American Diocese Orthodox Eastern Liturgical (Orthodox) +0 -400 -22.2%
Malankara Archdiocese of the Syrian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) +1 +222 +74.0%
Malankara Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) +1 -280 -28.0%
Mennonite Church USA Evangelical Protestant European Free-Church +0 -1,002 -11.7%
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups -2 -151 -42.1%
Midwest Beachy Amish Mennonite* Evangelical Protestant European Free-Church --- --- ---
Missionary Church, The Evangelical Protestant Holiness +10 -260 -8.2%
Moravian Church in America--Northern Province Mainline Protestant Methodist/Pietist +0 -24 -8.1%
Muslim Estimate Other Other Groups +29 +234,061 +186.9%
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed -5 -1,883 -37.8%
National Association of Free Will Baptists Evangelical Protestant Baptist +0 -47 -1.1%
National Baptist Convention of America, Inc. Black Protestant Baptist --- --- ---
National Baptist Convention, USA, Inc. Black Protestant Baptist --- --- ---
National Missionary Baptist Convention, Inc. Black Protestant Baptist --- --- ---
National Spiritualist Association of Churches Other Spiritualist --- --- ---
New Apostolic Church of North America, National Organization of the Other Other Groups --- --- ---
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist --- --- ---
Non-denominational Evangelical Protestant
----
--- --- ---
North American Baptist Conference Evangelical Protestant Baptist +1 -225 -11.2%
North American Lutheran Church Evangelical Protestant Lutheran --- --- ---
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal --- --- ---
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) +8 +1,041 +30.4%
Orthodox Judaism Other Judaism --- --- ---
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed +6 +336 +41.6%
Patriarchal Parishes of the Russian Orthodox Church in the USA Orthodox Eastern Liturgical (Orthodox) +0 --- ---
Pentecostal Church of God Evangelical Protestant Pentecostal -6 -392 -15.9%
Pentecostal Fire-Baptized Holiness Church Evangelical Protestant Pentecostal --- --- ---
Polish National Catholic Church Catholic Catholicism --- --- ---
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed -31 -32,665 -24.4%
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed +1 -1,277 -14.9%
Primitive Methodist Church in the USA Evangelical Protestant Methodist/Pietist +0 --- ---
Progressive National Baptist Convention, Inc. Black Protestant Baptist --- --- ---
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed +0 +93 +14.2%
Reconstructionist Judaism Other Judaism --- --- ---
Reform Judaism Other Judaism --- --- ---
Reformed Baptist Churches Evangelical Protestant Baptist +6 --- ---
Reformed Church in America Mainline Protestant Presbyterian-Reformed -10 -5,183 -28.9%
Reformed Mennonite Church Evangelical Protestant European Free-Church +0 -11 -20.8%
Reformed Presbyterian Church of North America Evangelical Protestant Presbyterian-Reformed --- --- ---
Romanian Orthodox Archdiocese in Americas Orthodox Eastern Liturgical (Orthodox) +1 +215 +41.0%
Russian Orthodox Church Outside of Russia Orthodox Eastern Liturgical (Orthodox) +1 --- ---
Salvation Army Evangelical Protestant Holiness -5 -4,386 -19.3%
Serbian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) +8 +854 +10.1%
Seventh Day Baptist General Conference, USA and Canada Evangelical Protestant Baptist --- --- ---
Seventh-day Adventist Church Evangelical Protestant Adventist +24 +5,324 +21.3%
Sikh Other Other Groups +1 --- ---
Southern Baptist Convention Evangelical Protestant Baptist +78 -22,319 -7.3%
Swedenborgian Church Other Spiritualist --- --- ---
Syriac Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) +1 +290 +107.4%
Tampico Amish Mennonite* Evangelical Protestant European Free-Church --- --- ---
Tao Other Other Groups +0 --- ---
Ukrainian Orthodox Church of the USA Orthodox Eastern Liturgical (Orthodox) +1 +562 +32.5%
Unaffiliated Conservative Amish Mennonite Church* Evangelical Protestant European Free-Church --- --- ---
Unaffiliated Friends Meetings* Mainline Protestant European Free-Church --- --- ---
Union of Messianic Jewish Congregations Other Judaism --- --- ---
Unitarian Universalist Association of Congregations Other Liberal +0 +867 +12.0%
United Church of Christ Mainline Protestant Presbyterian-Reformed -39 -42,374 -25.4%
United Holy Church of America, Inc. Black Protestant Pentecostal --- --- ---
United Methodist Church, The Mainline Protestant Methodist/Pietist -143 -50,721 -13.9%
United Pentecostal Church International Evangelical Protestant Pentecostal --- --- ---
United Pentecostal Council of the Assemblies of God Evangelical Protestant Pentecostal --- --- ---
United Reformed Churches in North America Evangelical Protestant Presbyterian-Reformed +0 --- ---
Unity Churches, Association of Other Other Groups --- --- ---
Vineyard USA Evangelical Protestant Pentecostal -2 +1,286 +17.7%
Wesleyan Church, The Evangelical Protestant Holiness -3 -1,695 -24.3%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran +5 -420 -4.4%
Zoroastrian Other Other Groups -2 --- ---
Totals: -363 -261,659 -4%

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.

The population of Illinois was 12,419,293 in 2000; in 1990 it was 11,430,602. The total population changed 8.6%. The adherent totals of the religious groups listed above (6,867,625) included 55.3% of the total population in 2000.

* 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.