County Membership Report
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Cook County, Illinois

Denominational Groups, 2000

270,818 261,906 74,202 2,146,961 344,061 2,278,793
Evangelical Protestant Mainline Protestant Orthodox Catholic Other Unclaimed

Congregational "adherents" include all full members, their children, and others who regularly attend services. The historically African American denominations are not included in the 2000 congregation and membership totals. Many are also missing in 1990 and most historically African American denominations are missing in the 1980 reports.
[More information on the data sources]

Reports


Religious Bodies Theology Congregations Adherents % Change
Southern Baptist Convention Evangelical Protestant +78 +42,003 199.0%
Jewish Estimate Other Theology +73 +196,977 526.0%
Seventh-day Adventist Church Evangelical Protestant +22 +5,688 58.0%
Greek Orthodox Archdiocese of America Orthodox +19 +29,049 n.a.
Assemblies of God Evangelical Protestant +18 +6,122 78.0%
Independent, Non-Charismatic Churches Evangelical Protestant +17 +8,027 n.a.
Evangelical Free Church of America, The Evangelical Protestant +17 +5,389 164.0%
Church of the Nazarene Evangelical Protestant +15 -1,057 -22.0%
Presbyterian Church in America Evangelical Protestant +13 +1,403 n.a.
Christian and Missionary Alliance, The Evangelical Protestant +10 +1,661 136.0%
Baptist General Conference Evangelical Protestant +9 +1,249 15.0%
Independent, Charismatic Churches Evangelical Protestant +7 +4,775 n.a.
Evangelical Covenant Church, The Evangelical Protestant +7 +2,914 42.0%
Church of Jesus Christ of Latter-day Saints, The Other Theology +7 +2,398 37.0%
Orthodox Church in America: Territorial Dioceses Orthodox +6 +2,244 n.a.
Salvation Army, The Evangelical Protestant +5 +1,734 40.0%
Churches of Christ Evangelical Protestant +4 +1,785 31.0%
Church of God of Prophecy Evangelical Protestant +4 +212 n.a.
Wesleyan Church, The Evangelical Protestant +4 +948 n.a.
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox +3 +19,650 n.a.
International Church of the Foursquare Gospel Evangelical Protestant +3 +718 102.0%
Friends (Quakers) Mainline Protestant +2 +147 32.0%
Church of the Brethren Evangelical Protestant +2 +321 102.0%
Orthodox Church in America: Romanian Orthodox Episcopate of America Orthodox +2 +3,000 n.a.
Ukrainian Orthodox Church of the USA Orthodox +2 +1,016 299.0%
Orthodox Presbyterian Church, The Evangelical Protestant +2 +329 731.0%
National Association of Congregational Christian Churches Mainline Protestant +2 +368 54.0%
National Association of Free Will Baptists Evangelical Protestant +2 +216 n.a.
Cumberland Presbyterian Church Evangelical Protestant +1 +46 657.0%
Apostolic Christian Church of America, Inc. Evangelical Protestant +1 +175 n.a.
Church of God (Anderson, Indiana) Evangelical Protestant +1 -4,095 -55.0%
American Carpatho-Russian Orthodox Greek Catholic Church Orthodox +1 +207 n.a.
Protestant Reformed Churches in America Evangelical Protestant +1 +129 30.0%
Evangelical Mennonite Church Evangelical Protestant +1 -24 -32.0%
Albanian Orthodox Diocese of America Orthodox +1 +270 n.a.
Netherlands Reformed Congregations Evangelical Protestant +1 +31 n.a.
Universal Fellowship of Metropolitan Community Churches Mainline Protestant +1 -626 -78.0%
Armenian Apostolic Church / Catholicossate of Cilicia Orthodox 0 +543 124.0%
International Pentecostal Holiness Church Evangelical Protestant 0 +21 32.0%
Baptist Missionary Association of America Evangelical Protestant 0 +31 58.0%
Free Methodist Church of North America Evangelical Protestant 0 -620 -73.0%
Mennonite Brethren Churches, U.S. Conference of Evangelical Protestant 0 -35 -71.0%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant -1 -510 -22.0%
Christian Churches and Churches of Christ Evangelical Protestant -1 +1,601 44.0%
American Baptist Churches in the USA Mainline Protestant -2 -987 -4.0%
Unitarian Universalist Association of Congregations Other Theology -2 -1,910 -42.0%
Reformed Church in America Mainline Protestant -2 -2,782 -24.0%
North American Baptist Conference Evangelical Protestant -2 -10 -1.0%
Missionary Church, The Evangelical Protestant -2 +26 10.0%
Conservative Baptist Association of America Evangelical Protestant -3 -1,893 -37.0%
Christian Reformed Church in North America Evangelical Protestant -5 -544 -4.0%
Christian Church (Disciples of Christ) Mainline Protestant -6 -2,345 -43.0%
Episcopal Church Mainline Protestant -6 -9,175 -29.0%
Church of God (Cleveland, Tennessee) Evangelical Protestant -7 +1,382 38.0%
United Church of Christ Mainline Protestant -9 -4,467 -8.0%
Lutheran Church--Missouri Synod Evangelical Protestant -10 -37,550 -37.0%
United Methodist Church, The Mainline Protestant -10 -28,336 -40.0%
Presbyterian Church (U.S.A.) Mainline Protestant -12 -14,771 -29.0%
Evangelical Lutheran Church in America Mainline Protestant -27 -39,634 -38.0%
Catholic Church Catholic -61 -156,782 -7.0%
  Totals: +196 36,652 +1.3%

The population of this county (or equivalent) in 1980 was 5,253,655; in 2000 it was 5,376,741. The total population changed 5.3%. The adherent totals for 1980 (2,945,183) represent 56.1% of the 1980 population. The adherent totals for 2000 (3,097,948) include 57.6% of the 2000 population. The totals represent the change in groups that reported in both 1980 and 2000 only. There is sufficient data for 60 groups to calculate 1980-2000 change. These 60 groups had 2,922,937 adherents in 1980 and 2,959,589 adherents in 2000, for a change of 1.3%

Sources

The 2000 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and includes statistics for 149 religious groups, including number of churches and adherents. Dale E. Jones, Sherri Doty, Clifford Grammich, James E. Horsch, Richard Houseal, Mac Lynn, John P. Marcum, Kenneth M. Sanchagrin and Richard H. Taylor supervised the collection. These data originally appeared in Religious Congregations & Membership in the United States, 2000, published by the Glenmary Research Center.

The 1980 data were collected by the Glenmary Research Center and include statistics for 111 Judeo-Christian church bodies, including number of churches and adherents. Bernard Quinn, Herman Anderson, Martin Bradley, Paul Goetting and Peggy Shriver supervised the collection. These data originally appeared in Churches and Church Membership in the United States, 1980, published by the Glenmary Research Center.

[More information on these data sources]