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Illinois - State Membership Report (2020)

Exact definitions of "congregations" and "adherents" vary by religious body. Congregations may be parishes, churches, synagogues, mosques, temples, or another site where a religious body has regularly scheduled worship services. Adherents generally are members, children who are not members, and others who are not members but are considered participants in the congregation.

[More information on the data sources]

Religious Bodies Tradition Family Congregations Adherents Adherence Rate
Catholic Church Catholic Catholic Liturgical Family 991 3,099,544 241.92
Non-denominational Christian Churches Evangelical Protestant Other Groups Family 1,383 589,448 46.01
Muslim Estimate Islam Islam Family 127 473,792 36.98
United Methodist Church Mainline Protestant Methodist Family 1,121 235,045 18.34
Southern Baptist Convention Evangelical Protestant Baptist Family 1,008 222,589 17.37
Lutheran Church-Missouri Synod (LCMS) Evangelical Protestant Lutheran Family 480 182,097 14.21
Evangelical Lutheran Church in America Mainline Protestant Lutheran Family 439 162,063 12.65
National Missionary Baptist Convention of America Black Protestant Baptist Family 456 161,734 12.62
Christian Churches and Churches of Christ Evangelical Protestant Restorationists Family 437 137,365 10.72
Assemblies of God, General Council of the Evangelical Protestant Pentecostal Family 315 106,173 8.29
United Church of Christ Mainline Protestant Congregationalists (United Church of Christ) Family 320 96,617 7.54
Jehovah's Witnesses Jehovah's Witnesses Adventist Family 394 93,798 7.32
National Baptist Convention, USA, Inc. Black Protestant Baptist Family 119 83,856 6.54
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian/Reformed Family 349 62,272 4.86
Church of God in Christ Black Protestant Pentecostal Family 214 59,740 4.66
Church of Jesus Christ of Latter-day Saints Latter-day Saints Latter-day Saints (Mormonism) Family 120 56,888 4.44
American Baptist Churches in the U.S.A. Mainline Protestant Baptist Family 240 49,864 3.89
Church of the Nazarene Evangelical Protestant Holiness Family 229 37,752 2.95
Reform Judaism Judaism Judaism Family 31 34,639 2.70
Episcopal Church Mainline Protestant Anglican/Episcopal Family 154 34,281 2.68
Seventh-day Adventist Church Evangelical Protestant Adventist Family 158 30,888 2.41
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) Family 34 29,020 2.26
Hindu, Traditional Temples Hinduism Hinduism Family 21 25,705 2.01
African Methodist Episcopal Church Black Protestant Methodist Family 97 24,899 1.94
Churches of Christ Evangelical Protestant Restorationists Family 250 22,871 1.79
Buddhism, Mahayana Buddhism Buddhism Family 45 21,345 1.67
Hindu Yoga and Meditation Hinduism 48 21,223 1.66
Conservative Judaism Judaism Judaism Family 17 17,348 1.35
Christian Church (Disciples of Christ) Mainline Protestant Restorationists Family 135 17,086 1.33
Progressive National Baptist Convention, Inc. Black Protestant Baptist Family 33 16,498 1.29
Orthodox Judaism Judaism Judaism Family 42 16,310 1.27
Evangelical Covenant Church Evangelical Protestant Methodist Family 75 15,873 1.24
Church of God (Anderson, Indiana) Evangelical Protestant Holiness Family 85 14,018 1.09
Buddhism, Theravada Buddhism Buddhism Family 24 11,577 0.90
Christian Methodist Episcopal Church Black Protestant Methodist Family 35 10,556 0.82
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal Family 118 10,382 0.81
Christian Reformed Church in North America Evangelical Protestant Presbyterian/Reformed Family 44 9,712 0.76
National Baptist Convention of America International, Inc. Black Protestant Baptist Family 17 9,676 0.76
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran Family 35 9,195 0.72
Presbyterian Church in America Evangelical Protestant Presbyterian/Reformed Family 48 8,916 0.70
Reformed Church in America Mainline Protestant Presbyterian/Reformed Family 34 8,581 0.67
International Church of the Foursquare Gospel Evangelical Protestant Pentecostal Family 41 8,102 0.63
Serbian Orthodox Church in North and South America Orthodox Eastern Liturgical (Orthodox) Family 11 7,830 0.61
Association of Vineyard Churches Evangelical Protestant Pentecostal Family 24 7,812 0.61
Apostolic Christian Church of America Evangelical Protestant Froehlich Churches Family 19 7,509 0.59
Unitarian Universalist Association Other Christians Liberal Family 36 7,428 0.58
Full Gospel Christian Assemblies International Evangelical Protestant Pentecostal Family 22 7,332 0.57
Amish Groups, undifferentiated Evangelical Protestant Mennonite/Amish Family 66 7,162 0.56
Lutheran Congregations in Mission for Christ Evangelical Protestant Lutheran Family 27 6,874 0.54
Mennonite Church, USA Evangelical Protestant Mennonite/Amish Family 40 6,577 0.51
Pentecostal Assemblies of the World Black Protestant Pentecostal Family 6 6,050 0.47
Christian and Missionary Alliance Evangelical Protestant Holiness Family 43 6,022 0.47
Baha'i Faith Other Other Groups Family 29 5,574 0.44
Salvation Army Evangelical Protestant Holiness Family 45 4,479 0.35
African Methodist Episcopal Zion Church Black Protestant Methodist Family 16 4,070 0.32
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) Family 5 3,931 0.31
Association of Free Lutheran Congregations Evangelical Protestant Lutheran Family 18 3,816 0.30
National Association of Free Will Baptists Evangelical Protestant Baptist Family 39 3,680 0.29
Fellowship of Evangelical Churches Evangelical Protestant Mennonite/Amish Family 21 3,578 0.28
Church of the Brethren Evangelical Protestant Friends/Brethren Family 37 3,553 0.28
General Association of General Baptists Evangelical Protestant Baptist Family 12 3,510 0.27
Macedonian Orthodox Church: American-Canadian Diocese Orthodox Eastern Liturgical (Orthodox) Family 2 3,475 0.27
Orthodox Church in America, The Orthodox Eastern Liturgical (Orthodox) Family 21 3,428 0.27
Buddhism, Vajrayana Buddhism Buddhism Family 10 3,410 0.27
Full Gospel Baptist Church Fellowship International Black Protestant Baptist Family 18 3,360 0.26
Churches of God, General Conference Evangelical Protestant Presbyterian/Reformed Family 21 3,156 0.25
Free Methodist Church – USA Evangelical Protestant Holiness Family 36 2,831 0.22
International Churches of Christ Evangelical Protestant Baptist Family 5 2,645 0.21
Ethiopian Orthodox Church Orthodox Eastern Liturgical (Orthodox) Family 3 2,500 0.20
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian/Reformed Family 13 2,491 0.19
Antiochian Orthodox Christian Archdiocese of North America Orthodox Eastern Liturgical (Orthodox) Family 7 2,440 0.19
Wesleyan Church Evangelical Protestant Holiness Family 18 2,409 0.19
Cumberland Presbyterian Church Evangelical Protestant Presbyterian/Reformed Family 30 2,408 0.19
Reconstructionist Judaism Judaism Judaism Family 4 2,379 0.19
Missionary Church, The Evangelical Protestant Holiness Family 24 2,191 0.17
Church of our Lord Jesus Christ of the Apostolic Faith, Inc. Black Protestant Pentecostal Family 9 1,716 0.13
American Baptist Association Evangelical Protestant Baptist Family 9 1,456 0.11
Ukrainian Orthodox Church of the U.S.A. Orthodox Eastern Liturgical (Orthodox) Family 3 1,405 0.11
Advent Christian Church Evangelical Protestant Adventist Family 5 1,269 0.10
Malankara (Indian) Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) Family 4 1,216 0.09
Open Bible Churches Evangelical Protestant Pentecostal Family 14 1,160 0.09
Eastern Pennsylvania Mennonite Church Evangelical Protestant Mennonite/Amish Family 6 1,005 0.08
Bulgarian Eastern Orthodox Diocese of the USA, Canada, and Australia Orthodox Eastern Liturgical (Orthodox) Family 3 990 0.08
Apostolic Christian Faith Evangelical Protestant Froehlich Churches Family 5 970 0.08
United Reformed Churches in North America Evangelical Protestant Presbyterian/Reformed Family 5 967 0.08
Eritrean Orthodox Church Orthodox Eastern Liturgical (Orthodox) Family 2 880 0.07
National Association of Congregational Christian Churches Mainline Protestant Congregationalists (United Church of Christ) Family 12 801 0.06
Armenian Apostolic Church (Catholicosate of Etchmiadzin) Orthodox Eastern Liturgical (Orthodox) Family 5 770 0.06
Romanian Orthodox Metropolia of the Americas Orthodox Eastern Liturgical (Orthodox) Family 1 750 0.06
Friends General Conference Mainline Protestant Friends/Brethren Family 11 732 0.06
Protestant Reformed Churches in America Evangelical Protestant Presbyterian/Reformed Family 3 673 0.05
Primitive Baptists Associations Evangelical Protestant Baptist Family 6 556 0.04
Armenian Apostolic Church (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) Family 3 535 0.04
Albanian Orthodox Diocese of America Orthodox Eastern Liturgical (Orthodox) Family 1 500 0.04
Midwest Beachy Amish Mennonite Evangelical Protestant Mennonite/Amish Family 4 445 0.03
Malankara Archdiocese of the Syrian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) Family 2 440 0.03
Apostolic Christian Church (Nazarene) - West Conference Evangelical Protestant Froehlich Churches Family 1 405 0.03
Russian Orthodox Church Outside of Russia, The Orthodox Eastern Liturgical (Orthodox) Family 5 395 0.03
Tampico Amish Mennonite Evangelical Protestant Mennonite/Amish Family 1 388 0.03
Beachy Amish Mennonite Churches Evangelical Protestant Mennonite/Amish Family 2 356 0.03
German Apostolic / Christian Apostolic Churches Evangelical Protestant Froehlich Churches Family 5 353 0.03
Church of the Genuine Orthodox Christians of America Orthodox Eastern Liturgical (Orthodox) Family 2 350 0.03
Cumberland Presbyterian Church in America Black Protestant Presbyterian/Reformed Family 2 286 0.02
American Carpatho-Russian Orthodox Diocese of the USA Orthodox Eastern Liturgical (Orthodox) Family 3 285 0.02
Church of God General Conference (Abrahamic Faith, McDonough, GA) Evangelical Protestant Adventist Family 7 262 0.02
Moravian Church in America (Unitas Fratrum), Northern Province Mainline Protestant 1 243 0.02
United House of Prayer Black Protestant 1 210 0.02
Christian Apostolic Church Evangelical Protestant Froehlich Churches Family 2 188 0.01
North American and Europe Region of the Knanaya Archdiocese of the Syriac Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) Family 1 160 0.01
Syrian (Syriac) Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) Family 2 160 0.01
Congregational Christian Churches, Additional (not part of any national CCC body) Mainline Protestant Presbyterian/Reformed Family 1 147 0.01
Unaffiliated Amish-Mennonite (Conservative) Evangelical Protestant Mennonite/Amish Family 2 139 0.01
Church of God in Christ, Mennonite Evangelical Protestant Mennonite/Amish Family 1 133 0.01
Conservative Mennonite Conference Evangelical Protestant Mennonite/Amish Family 2 133 0.01
Evangelical Lutheran Synod Evangelical Protestant Lutheran Family 2 128 0.01
Friends General Conference and Friends United Meeting, dually aligned meetings Mainline Protestant Friends/Brethren Family 2 128 0.01
Berea Amish Mennonite Evangelical Protestant Mennonite/Amish Family 2 124 0.01
Biblical Mennonite Alliance Evangelical Protestant Mennonite/Amish Family 1 114 0.01
Georgian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) Family 1 100 0.01
Stauffer Mennonite Church Evangelical Protestant Mennonite/Amish Family 1 94 0.01
Universal Fellowship of Metropolitan Community Churches Mainline Protestant Other Groups Family 3 94 0.01
Mid-Atlantic Mennonite Fellowship Evangelical Protestant Mennonite/Amish Family 1 79 0.01
Church of the United Brethren in Christ, USA Evangelical Protestant Methodist Family 3 79 0.01
Evangelical Friends Church International Evangelical Protestant Friends/Brethren Family 1 74 0.01
Friends United Meeting Mainline Protestant Friends/Brethren Family 1 65 0.01
Reformed Presbyterian Church of North America (Covenanters) Evangelical Protestant Presbyterian/Reformed Family 2 43 0.00
Independent Judaism Judaism 7 40 0.00
Holy Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) Family 1 28 0.00
Reformed Mennonite Church Evangelical Protestant Mennonite/Amish Family 1 28 0.00
Seventh Day Baptist General Conference of the United States and Canada Evangelical Protestant Baptist Family 1 26 0.00
Ecumenical Catholic Communion Other Christians 1 25 0.00
Northern New Salem Association of Old Regular Baptists. Evangelical Protestant Baptist Family 1 13 0.00
Swedenborgian Church Other Christians Spiritualist Family 1 4 0.00
Evangelical Church of North America Evangelical Protestant Holiness Family 1 0 0.00
Churches of Christ in Christian Union Evangelical Protestant Holiness Family 2
Federation of Reformed Churches Evangelical Protestant Presbyterian/Reformed Family 1
Christadelphians Other Christians Other Groups Family 7
Orthodox Old Roman Catholic Communion Catholic Other Groups Family 2
ECO: A Covenant Order of Evangelical Presbyterians Evangelical Protestant Presbyterian/Reformed Family 12
Anglican Province of Christ the King Mainline Protestant Anglican/Episcopal Family 1
Anglican Church in America Mainline Protestant Anglican/Episcopal Family 2
Fellowship of Christian Assemblies Evangelical Protestant Pentecostal Family 12
Grace Communion International Evangelical Protestant 5
United Church of God Other Christians Adventist Family 4
Vedanta Society Other Other Groups Family 1
American Ethical Union Other Liberal Family 1
Church of the Living God (Christian Workers for Fellowship) Black Protestant Pentecostal Family 7
Church of God and Saints of Christ Other Christians Judaism Family 1
Liberal Catholic Church, Province of the United States of America Other Christians Other Groups Family 1
Christian Congregation in North America Evangelical Protestant Pentecostal Family 2
Full Gospel Assemblies International Evangelical Protestant Pentecostal Family 2
Reformed Baptist Network Evangelical Protestant 1
Southern Illinois Christian Conference Evangelical Protestant 10
The Church of God Evangelical Protestant 1
The Local Churches Evangelical Protestant 10
Bible Methodist Connection of Churches Evangelical Protestant Holiness Family 1
Unification Church Other Other Groups Family 1
Covenant Presbyterian Church Evangelical Protestant 1
Evangelical Lutheran Diocese of North America Evangelical Protestant 2
Concordia Lutheran Conference Evangelical Protestant 3
Laestadian Lutheran Church Evangelical Protestant 1
Every Nation Evangelical Protestant 1
Chabad Judaism Judaism 13
Alliance of Baptists Mainline Protestant Baptist Family 2
Anglican Church in North America Evangelical Protestant Anglican/Episcopal Family 33
Apostolic Faith Mission of Portland, Oregon Evangelical Protestant Pentecostal Family 1
Association of Reformed Baptist Churches of America Evangelical Protestant Baptist Family 1
Baptist Missionary Association of America Evangelical Protestant Baptist Family 6
Bethel Ministerial Association Evangelical Protestant Pentecostal Family 5
Brethren Church (Ashland, Ohio) Evangelical Protestant Friends/Brethren Family 3
Brethren in Christ Church Evangelical Protestant Friends/Brethren Family 2
Calvary Chapel Evangelical Protestant Pentecostal Family 1
Church of Christ (Holiness) U.S.A Evangelical Protestant Holiness Family 6
Church of Christ, Scientist Other Christians Christian Science Family 10
Unity Churches, Association of Other Christians Other Groups Family 21
General Conference of the Church of God (Seventh Day) Evangelical Protestant Adventist Family 10
Church of God of Prophecy Evangelical Protestant Pentecostal Family 19
Church of the Lutheran Brethren of America Evangelical Protestant Lutheran Family 1
Church of the Lutheran Confession Evangelical Protestant Lutheran Family 2
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian/Reformed Family 2
Community of Christ Evangelical Protestant Latter-day Saints (Mormonism) Family 35
Conservative Baptist Association of America (CBAmerica) Evangelical Protestant Baptist Family 25
Elim Fellowship Evangelical Protestant Pentecostal Family 3
Evangelical Association of Reformed and Congregational Christian Churches Evangelical Protestant Presbyterian/Reformed Family 4
Evangelical Congregational Church Evangelical Protestant Methodist Family 5
Evangelical Free Church of America Evangelical Protestant Methodist Family 113
Evangelical Methodist Church Evangelical Protestant Methodist Family 2
Evangelical Presbyterian Church (1981) Evangelical Protestant Presbyterian/Reformed Family 18
Fire Baptized Holiness Church (Wesleyan) Evangelical Protestant Holiness Family 1
General Church of the New Jerusalem Other Christians Spiritualist Family 2
Grace Gospel Fellowship Evangelical Protestant Independent Fundamentalist Family 4
International Fellowship of Bible Churches Evangelical Protestant Holiness Family 2
International Council of Community Churches Mainline Protestant Presbyterian/Reformed Family 4
Jain Other Other Groups Family 1
American Association of Lutheran Churches Evangelical Protestant Lutheran Family 1
National Spiritualist Association of Churches Other Spiritualist Family 5
Netherlands Reformed Congregations Evangelical Protestant Presbyterian/Reformed Family 1
New Testament Association of Independent Baptist Churches Evangelical Protestant Baptist Family 9
New Apostolic Church USA Other Christians Other Groups Family 9
North American Baptist Conference Evangelical Protestant Baptist Family 11
North American Lutheran Church Evangelical Protestant Lutheran Family 21
Orthodox Presbyterian Church Evangelical Protestant Presbyterian/Reformed Family 12
Pentecostal Church of God Evangelical Protestant Pentecostal Family 9
Pentecostal Fire-Baptized Holiness Church Evangelical Protestant Pentecostal Family 4
Polish National Catholic Church of America Catholic Catholic Liturgical Family 6
Christian Brethren (Plymouth Brethren) Evangelical Protestant Independent Fundamentalist Family 34
Primitive Methodist Church in the U.S.A. Evangelical Protestant Methodist Family 1
Reformed Episcopal Church Evangelical Protestant Anglican/Episcopal Family 1
General Association of Regular Baptist Churches Evangelical Protestant Baptist Family 54
American Sikh Council Other Other Groups Family 6
Tao Other Other Groups Family 1
Union of Messianic Jewish Congregations Other Christians Other Groups Family 3
United Pentecostal Church International Evangelical Protestant Pentecostal Family 201
Federation of Zoroastrian Associations of North America Other Other Groups Family 1
           

Religious Traditions (1980 - 2020), Percent of Population


The population of this state was 12,812,508 in 2020. The adherent totals of the religious groups listed above (6,510,363) included 50.8% of the total population in 2020. The adherence rate is the number of adherents of a given group per 1,000 people in the general population.

Note that data collection methods for religious bodies change over time, affecting the comparability of statistics. For further information, see the U.S. Religion Census website at https://www.usreligioncensus.org/.

The 2020 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include data for 372 religious bodies or groups. Of these, the ASARB was able to gather data on congregations and adherents for 217 and on congregations only for 155.

[More information on the data sources]

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