State Membership Report
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Illinois

Denominational Groups, 2000

1,279,050 1,177,187 92,297 3,874,933 443,633 5,552,193
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
Albanian Orthodox Diocese of America Orthodox 0 n.a. n.a.
Allegheny Wesleyan Methodist Connection Evangelical Protestant 0 -1 -5.3%
American Baptist Churches in the USA Mainline Protestant 0 -8,478 -8.8%
American Carpatho-Russian Orthodox Greek Catholic Church Orthodox 0 +59 16.6%
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox +1 -4,397 -16.2%
Apostolic Christian Church of America, Inc. Evangelical Protestant +1 +1,384 16.4%
Apostolic Christian Churches (Nazarene) Evangelical Protestant 0 +265 90.4%
Armenian Apostolic Church / Catholicossate of Cilicia Orthodox 0 -2,629 -64.9%
Assemblies of God Evangelical Protestant -2 +16,237 20.1%
Association of Free Lutheran Congregations, The Evangelical Protestant +5 +1,380 53.5%
Baptist General Conference Evangelical Protestant -1 +2,568 15.4%
Baptist Missionary Association of America Evangelical Protestant +2 -1,025 -46.0%
Beachy Amish Mennonite Churches Evangelical Protestant +2 +152 70.7%
Brethren Church, The (Ashland, Ohio) Evangelical Protestant -1 -150 -22.4%
Brethren In Christ Church Evangelical Protestant -1 -8 -11.3%
Catholic Church Catholic +36 +263,900 7.3%
Christian and Missionary Alliance, The Evangelical Protestant -6 +75 1.2%
Christian Church (Disciples of Christ) Mainline Protestant -32 -8,908 -13.6%
Christian Churches and Churches of Christ Evangelical Protestant +21 +15,164 12.7%
Christian Reformed Church in North America Evangelical Protestant -3 +1,476 8.5%
Church of God (Anderson, Indiana) Evangelical Protestant -10 +96 1.0%
Church of God (Cleveland, Tennessee) Evangelical Protestant -1 +3,077 20.3%
Church of God General Conference Evangelical Protestant +1 -45 -5.4%
Church of God of Prophecy Evangelical Protestant -7 -237 -17.5%
Church of Jesus Christ of Latter-day Saints, The Other Theology +31 +5,507 18.1%
Church of the Brethren Evangelical Protestant +1 -513 -7.6%
Church of the Nazarene Evangelical Protestant -21 -4,006 -9.5%
Churches of Christ Evangelical Protestant -5 -4,039 -12.1%
Churches of God, General Conference Evangelical Protestant -2 +33 0.8%
Conservative Baptist Association of America Evangelical Protestant -2 n.a. n.a.
Conservative Congregational Christian Conference Evangelical Protestant +3 +129 6.4%
Cumberland Presbyterian Church Evangelical Protestant -3 -236 -7.4%
Eastern Pennsylvania Mennonite Church Evangelical Protestant 0 +151 111.9%
Episcopal Church Mainline Protestant +16 -2,173 -4.0%
Evangelical Free Church of America, The Evangelical Protestant +38 +9,801 50.0%
Evangelical Lutheran Church in America Mainline Protestant -15 -17,244 -5.8%
Evangelical Mennonite Church Evangelical Protestant +4 +1,099 81.8%
Evangelical Presbyterian Church Evangelical Protestant +1 +317 84.1%
Free Methodist Church of North America Evangelical Protestant -9 +242 4.3%
Friends (Quakers) Mainline Protestant -1 +346 17.2%
Greek Orthodox Archdiocese of America Orthodox +2 n.a. n.a.
Independent, Charismatic Churches Evangelical Protestant -5 -3,532 -23.7%
Independent, Non-Charismatic Churches Evangelical Protestant +7 +2,490 5.2%
International Church of the Foursquare Gospel Evangelical Protestant +15 -530 -4.7%
International Pentecostal Holiness Church Evangelical Protestant 0 -144 -39.2%
Jewish Estimate Other Theology -23 +812 0.3%
Lutheran Church--Missouri Synod Evangelical Protestant +2 -17,812 -6.0%
Mennonite Brethren Churches, U.S. Conference of Evangelical Protestant 0 -11 -44.0%
Mennonite Church USA Evangelical Protestant -23 -1,039 -10.8%
Missionary Church, The Evangelical Protestant -4 +693 27.8%
Moravian Church in America--Northern Province Mainline Protestant 0 -149 -33.3%
National Association of Congregational Christian Churches Mainline Protestant -4 -196 -3.8%
National Association of Free Will Baptists Evangelical Protestant 0 -958 -18.0%
Netherlands Reformed Congregations Evangelical Protestant 0 +15 93.8%
North American Baptist Conference Evangelical Protestant -3 -358 -15.1%
Old Order Amish Church Evangelical Protestant +15 -494 -17.6%
Orthodox Church in America: Romanian Orthodox Episcopate of America Orthodox 0 n.a. n.a.
Orthodox Church in America: Territorial Dioceses Orthodox -2 n.a. n.a.
Pentecostal Church of God Evangelical Protestant +5 +899 57.6%
Presbyterian Church (U.S.A.) Mainline Protestant -21 -24,343 -15.4%
Presbyterian Church in America Evangelical Protestant +17 +3,077 56.0%
Primitive Methodist Church in the USA Evangelical Protestant 0 -81 -57.0%
Reformed Church in America Mainline Protestant -3 -2,260 -11.2%
Salvation Army, The Evangelical Protestant -1 +15,556 215.8%
Seventh-day Adventist Church Evangelical Protestant +5 +604 2.5%
Southern Baptist Convention Evangelical Protestant +64 +13,194 4.5%
Syrian Orthodox Church of Antioch Orthodox -2 -1,630 -85.8%
Ukrainian Orthodox Church of the USA Orthodox +2 n.a. n.a.
Unitarian Universalist Association of Congregations Other Theology -4 -950 -11.6%
United Church of Christ Mainline Protestant -21 -18,786 -10.1%
United Methodist Church, The Mainline Protestant -92 -75,499 -17.1%
Wesleyan Church, The Evangelical Protestant -7 +2,757 65.6%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant -3 -1,126 -10.5%
  Totals: -43 +159,568 +2.5%

The population of these 102 counties (or equivalents) in 1990 was 11,430,602; in 2000 it was 12,419,293. The total population changed 8.6%. The adherent totals for 1990 (6,848,422) represent 59.9% of the 1990 population. The adherent totals for 2000 (6,867,100) include 55.3% of the 2000 population. There is sufficient data for 67 groups to calculate 1990-2000 change. These 67 groups had 6,418,388 adherents in 1990 and 6,577,956 adherents in 2000, for a change of 2.5%

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 1990 data were collected by the Association of Statisticians of American Religious Bodies (ASARB) and include statistics for 132 religious groups, including number of churches and adherents. Martin B. Bradley, Norman M. Green, Jr., Dale E. Jones, Mac Lynn, and Lou McNeil supervised the collection. These data originally appeared in Churches and Church Membership in the United States, 1990, published by the Glenmary Research Center.

[More information on these data sources]