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Cook County, Illinois

Religious Traditions, 2010

432,975 148,895 202,114 53,276 1,947,223 312,636 2,097,556
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
Free Methodist Church of North America Evangelical Protestant Holiness -1 +456 +201.8%
Antiochian Orthodox Christian Archdiocese of North America, The Orthodox Eastern Liturgical (Orthodox) +1 +2,742 +192.0%
Assemblies of God Evangelical Protestant Pentecostal -2 +18,633 +133.0%
American Carpatho-Russian Orthodox Diocese Orthodox Eastern Liturgical (Orthodox) +1 +243 +117.4%
Muslim Estimate Other Other Groups +16 +105,529 +110.4%
Church of Jesus Christ of Latter-day Saints, The Other Latter-day Saints +3 +7,646 +86.3%
Malankara Archdiocese of the Syrian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) +1 +222 +74.0%
Presbyterian Church in America Evangelical Protestant Presbyterian-Reformed +3 +785 +56.0%
Armenian Apostolic Church of America (Catholicosate of Cilicia) Orthodox Eastern Liturgical (Orthodox) +0 +520 +53.1%
Missionary Church, The Evangelical Protestant Holiness +7 +157 +52.9%
Vineyard USA Evangelical Protestant Pentecostal +2 +603 +42.1%
Orthodox Church in America Orthodox Eastern Liturgical (Orthodox) +5 +942 +42.0%
Romanian Orthodox Archdiocese in Americas Orthodox Eastern Liturgical (Orthodox) +1 +215 +41.0%
Fellowship of Evangelical Churches Evangelical Protestant European Free-Church -1 +20 +38.5%
Pentecostal Church of God Evangelical Protestant Pentecostal +0 +29 +36.3%
Church of the Nazarene Evangelical Protestant Holiness -5 +1,162 +30.1%
Albanian Orthodox Diocese of America Orthodox Eastern Liturgical (Orthodox) +0 +80 +29.6%
Ukrainian Orthodox Church of the USA Orthodox Eastern Liturgical (Orthodox) +0 +384 +28.3%
Seventh-day Adventist Church Evangelical Protestant Adventist +6 +3,193 +20.6%
Church of God (Cleveland, Tennessee) Evangelical Protestant Pentecostal +7 +754 +15.1%
Foursquare Gospel, International Church of the Evangelical Protestant Pentecostal -2 +193 +13.6%
Cumberland Presbyterian Church Evangelical Protestant Presbyterian-Reformed +0 +7 +13.2%
Bahá'í Other Other Groups -3 +276 +11.0%
Mennonite Church USA Evangelical Protestant European Free-Church +0 +281 +9.4%
Orthodox Presbyterian Church, The Evangelical Protestant Presbyterian-Reformed +2 +31 +8.3%
Greek Orthodox Archdiocese of America Orthodox Eastern Liturgical (Orthodox) -1 +1,821 +6.3%
Unitarian Universalist Association of Congregations Other Liberal -2 +17 +0.6%
Metropolitan Community Churches, Universal Fellowship of Mainline Protestant Other Groups -1 -9 -5.2%
Catholic Church Catholic Catholicism +1 -199,738 -9.3%
Christian Church (Disciples of Christ) Mainline Protestant Restoration Movement +0 -306 -9.7%
Churches of Christ Evangelical Protestant Restoration Movement -4 -789 -10.4%
American Baptist Churches in the USA Mainline Protestant Baptist -4 -2,365 -10.8%
North American Baptist Conference Evangelical Protestant Baptist +1 -95 -10.9%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant Lutheran +3 -258 -14.1%
Evangelical Covenant Church, The Evangelical Protestant Methodist/Pietist +8 -1,443 -14.7%
Christian and Missionary Alliance, The Evangelical Protestant Holiness +6 -439 -15.2%
Episcopal Church Mainline Protestant Episcopalianism/Anglicanism -14 -3,401 -15.3%
Church of God (Anderson, Indiana) Evangelical Protestant Holiness +0 -531 -15.6%
National Association of Congregational Christian Churches Mainline Protestant Presbyterian-Reformed +0 -168 -16.1%
Church of God of Prophecy Evangelical Protestant Pentecostal +0 -35 -16.5%
Apostolic Christian Church of America, Inc. Evangelical Protestant European Free-Church +0 -30 -17.1%
Presbyterian Church (U.S.A.) Mainline Protestant Presbyterian-Reformed -10 -6,429 -17.4%
Southern Baptist Convention Evangelical Protestant Baptist +31 -13,175 -20.9%
Evangelical Lutheran Church in America Mainline Protestant Lutheran -15 -13,496 -21.3%
United Methodist Church, The Mainline Protestant Methodist/Pietist -23 -9,128 -21.4%
Converge Worldwide/Baptist General Conference Evangelical Protestant Baptist +10 -2,153 -23.0%
United Church of Christ Mainline Protestant Presbyterian-Reformed -9 -12,881 -24.4%
Serbian Orthodox Church in North America Orthodox Eastern Liturgical (Orthodox) +4 -1,967 -26.2%
Community of Christ Other Latter-day Saints -1 -87 -26.4%
Christian Reformed Church in North America Evangelical Protestant Presbyterian-Reformed -1 -3,272 -26.7%
Lutheran Church--Missouri Synod Evangelical Protestant Lutheran -15 -17,835 -27.9%
Malankara Orthodox Syrian Church Orthodox Eastern Liturgical (Orthodox) +1 -280 -28.0%
Evangelical Free Church of America, The Evangelical Protestant Methodist/Pietist -8 -2,480 -28.6%
Reformed Church in America Mainline Protestant Presbyterian-Reformed -8 -3,263 -37.0%
Christian Churches and Churches of Christ Evangelical Protestant Restoration Movement -5 -2,055 -39.0%
Salvation Army Evangelical Protestant Holiness -4 -2,554 -41.7%
Conservative Congregational Christian Conference Evangelical Protestant Presbyterian-Reformed +0 -117 -49.6%
National Association of Free Will Baptists Evangelical Protestant Baptist -1 -111 -51.4%
Bulgarian Eastern Orthodox Diocese of the USA, Canada and Australia Orthodox Eastern Liturgical (Orthodox) +0 -475 -52.8%
Protestant Reformed Churches in America Evangelical Protestant Presbyterian-Reformed +0 -302 -53.5%
Wesleyan Church, The Evangelical Protestant Holiness +0 -617 -65.1%
International Churches of Christ Evangelical Protestant Baptist +0 -3,284 -71.7%
Church of the Brethren Evangelical Protestant European Free-Church -2 -465 -73.0%
International Pentecostal Holiness Church Evangelical Protestant Pentecostal -1 -63 -73.3%
Macedonian Orthodox Church: American Diocese Orthodox Eastern Liturgical (Orthodox) +0 -600 -75.0%
Armenian Church of North America (Catholicosate of Etchmiadzin) Orthodox Eastern Liturgical (Orthodox) +0 -2,838 -77.0%
African Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
African Methodist Episcopal Zion Church Black Protestant Methodist/Pietist --- --- ---
Alliance of Baptists Mainline Protestant Baptist --- --- ---
Anglican Church in North America Evangelical Protestant Episcopalianism/Anglicanism --- --- ---
Apostolic Faith Mission of Portland, OR Evangelical Protestant Pentecostal --- --- ---
Brethren In Christ Church Evangelical Protestant European Free-Church --- --- ---
Calvary Chapel Fellowship Churches Evangelical Protestant Pentecostal +0 --- ---
Christian Brethren Evangelical Protestant Ind. Fundamentalist --- --- ---
Christian Methodist Episcopal Church Black Protestant Methodist/Pietist --- --- ---
Church of Christ (Holiness), U.S.A. Evangelical Protestant Holiness --- --- ---
Church of Christ, Scientist Other Christian Science --- --- ---
Church of God (Seventh Day) Evangelical Protestant Adventist --- --- ---
Church of God in Christ Black Protestant Pentecostal --- --- ---
Church of Our Lord Jesus Christ of the Apostolic Faith, Inc. Black Protestant Pentecostal --- --- ---
Communion of Reformed Evangelical Churches Evangelical Protestant Presbyterian-Reformed --- --- ---
Conservative Baptist Association of America Evangelical Protestant Baptist -4 --- ---
Conservative Judaism Other Judaism --- --- ---
Coptic Orthodox Church Orthodox Eastern Liturgical (Orthodox) --- --- ---
Cumberland Presbyterian Church in America Black Protestant Presbyterian-Reformed --- --- ---
Elim Fellowship Evangelical Protestant Pentecostal --- --- ---
Eritrean Orthodox Orthodox Eastern Liturgical (Orthodox) --- --- ---
Ethiopian Orthodox Orthodox Eastern Liturgical (Orthodox) --- --- ---
Evangelical Congregational Church, The Evangelical Protestant Methodist/Pietist --- --- ---
Evangelical Friends Church International* Evangelical Protestant European Free-Church --- --- ---
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 +1 --- ---
Georgian Orthodox Parishes in the United States Orthodox Eastern Liturgical (Orthodox) --- --- ---
Grace Gospel Fellowship Evangelical Protestant Ind. Fundamentalist --- --- ---
Hungarian Reformed Churches (Additional) Mainline Protestant Presbyterian-Reformed --- --- ---
Independent Fundamental Churches of America Evangelical Protestant Ind. Fundamentalist --- --- ---
International Council of Community Churches Mainline Protestant Presbyterian-Reformed -4 --- ---
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 --- --- ---
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 Lutheran Church Evangelical Protestant Lutheran --- --- ---
Open Bible Standard Churches, Inc. Evangelical Protestant Pentecostal --- --- ---
Orthodox Judaism Other Judaism --- --- ---
Pentecostal Fire-Baptized Holiness Church Evangelical Protestant Pentecostal --- --- ---
Polish National Catholic Church Catholic Catholicism --- --- ---
Progressive National Baptist Convention, Inc. Black Protestant Baptist --- --- ---
Reconstructionist Judaism Other Judaism --- --- ---
Reform Judaism Other Judaism --- --- ---
Reformed Baptist Churches Evangelical Protestant Baptist --- --- ---
Russian Orthodox Church Outside of Russia Orthodox Eastern Liturgical (Orthodox) +0 --- ---
Sikh Other Other Groups +1 --- ---
Swedenborgian Church Other Spiritualist --- --- ---
Syriac Orthodox Church of Antioch Orthodox Eastern Liturgical (Orthodox) --- --- ---
Unaffiliated Friends Meetings* Mainline Protestant European Free-Church --- --- ---
Union of Messianic Jewish Congregations Other Judaism --- --- ---
United Holy Church of America, Inc. Black Protestant Pentecostal --- --- ---
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 --- --- ---
Zoroastrian Other Other Groups --- --- ---
Totals: -29 -162,593 -6%

The population of Cook County, Illinois was 5,194,675 in 2010; in 2000 it was 5,376,741. The total population changed -3.4%. The adherent totals of the religious groups listed above (3,097,119) included 59.6% of the total population in 2010.

The population of Cook County, Illinois was 5,376,741 in 2000; in 1990 it was 5,105,067. The total population changed 5.3%. The adherent totals of the religious groups listed above (3,098,473) included 57.6% 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.


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