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
Jewish Estimate Other Theology +93 +223,969 487.0%
Southern Baptist Convention Evangelical Protestant +93 +41,526 16.0%
Evangelical Free Church of America, The Evangelical Protestant +59 +17,752 152.0%
Church of Jesus Christ of Latter-day Saints, The Other Theology +54 +12,249 52.0%
Christian Churches and Churches of Christ Evangelical Protestant +52 +23,662 21.0%
Independent, Non-Charismatic Churches Evangelical Protestant +47 +50,545 n.a.
Assemblies of God Evangelical Protestant +45 +34,231 55.0%
National Association of Free Will Baptists Evangelical Protestant +41 +4,351 n.a.
Greek Orthodox Archdiocese of America Orthodox +35 +36,801 n.a.
Seventh-day Adventist Church Evangelical Protestant +34 +7,470 42.0%
Presbyterian Church in America Evangelical Protestant +32 +7,266 557.0%
Wesleyan Church, The Evangelical Protestant +28 +6,961 n.a.
International Church of the Foursquare Gospel Evangelical Protestant +27 +1,662 18.0%
Churches of God, General Conference Evangelical Protestant +27 +4,413 n.a.
Christian and Missionary Alliance, The Evangelical Protestant +25 +3,022 94.0%
Pentecostal Church of God Evangelical Protestant +25 +2,460 n.a.
Old Order Amish Church Evangelical Protestant +22 +417 22.0%
Church of God of Prophecy Evangelical Protestant +21 +1,118 n.a.
Apostolic Christian Church of America, Inc. Evangelical Protestant +19 +9,812 n.a.
Independent, Charismatic Churches Evangelical Protestant +17 +11,398 n.a.
Lutheran Church--Missouri Synod Evangelical Protestant +15 -35,417 -11.0%
Association of Free Lutheran Congregations, The Evangelical Protestant +14 +3,807 2505.0%
American Baptist Association, The Evangelical Protestant +11 +346 43.0%
Orthodox Church in America: Territorial Dioceses Orthodox +11 +3,428 n.a.
Baptist General Conference Evangelical Protestant +10 +3,052 19.0%
Evangelical Covenant Church, The Evangelical Protestant +7 +2,677 18.0%
Evangelical Mennonite Church Evangelical Protestant +6 +1,322 118.0%
Orthodox Presbyterian Church, The Evangelical Protestant +5 +440 120.0%
Evangelical Presbyterian Church Evangelical Protestant +4 +694 n.a.
Conservative Congregational Christian Conference Evangelical Protestant +4 +772 56.0%
Apostolic Catholic Assyrian Church of the East, North American Dioceses Orthodox +4 +22,785 n.a.
Christian Reformed Church in North America Evangelical Protestant +4 +2,233 13.0%
Universal Fellowship of Metropolitan Community Churches Mainline Protestant +4 -441 -55.0%
Salvation Army, The Evangelical Protestant +4 +452 2.0%
Baptist Missionary Association of America Evangelical Protestant +3 +326 37.0%
Beachy Amish Mennonite Churches Evangelical Protestant +3 +185 102.0%
Ukrainian Orthodox Church of the USA Orthodox +3 +1,388 408.0%
Church of the Brethren Evangelical Protestant +3 -1,030 -14.0%
Eastern Pennsylvania Mennonite Church Evangelical Protestant +3 +286 n.a.
Protestant Reformed Churches in America Evangelical Protestant +2 +219 50.0%
American Carpatho-Russian Orthodox Greek Catholic Church Orthodox +2 +414 n.a.
International Pentecostal Holiness Church Evangelical Protestant +2 +111 99.0%
Church of God General Conference Evangelical Protestant +2 +33 4.0%
Orthodox Church in America: Romanian Orthodox Episcopate of America Orthodox +2 +3,000 n.a.
Albanian Orthodox Diocese of America Orthodox +1 +270 n.a.
Allegheny Wesleyan Methodist Connection Evangelical Protestant +1 +18 n.a.
Separate Baptists in Christ Evangelical Protestant +1 +1 0.0%
Netherlands Reformed Congregations Evangelical Protestant +1 +31 n.a.
Mennonite Brethren Churches, U.S. Conference of Evangelical Protestant 0 -35 -71.0%
Brethren Church, The (Ashland, Ohio) Evangelical Protestant 0 -287 -36.0%
Brethren In Christ Church Evangelical Protestant 0 -10 -14.0%
Armenian Apostolic Church / Catholicossate of Cilicia Orthodox 0 +844 146.0%
Moravian Church in America--Northern Province Mainline Protestant 0 -170 -36.0%
Primitive Methodist Church in the USA Evangelical Protestant 0 -133 -69.0%
Apostolic Christian Churches (Nazarene) Evangelical Protestant 0 +267 92.0%
Wisconsin Evangelical Lutheran Synod Evangelical Protestant 0 -369 -4.0%
National Association of Congregational Christian Churches Mainline Protestant 0 +65 1.0%
Friends (Quakers) Mainline Protestant 0 +17 1.0%
Syrian Orthodox Church of Antioch Orthodox -1 -575 -68.0%
Reformed Church in America Mainline Protestant -1 -3,352 -16.0%
American Baptist Churches in the USA Mainline Protestant -2 -16,653 -16.0%
Unitarian Universalist Association of Congregations Other Theology -2 -1,983 -22.0%
Cumberland Presbyterian Church Evangelical Protestant -2 +90 3.0%
North American Baptist Conference Evangelical Protestant -3 -627 -24.0%
Missionary Church, The Evangelical Protestant -3 +956 43.0%
Conservative Baptist Association of America Evangelical Protestant -4 -2,414 -24.0%
Episcopal Church Mainline Protestant -6 -21,266 -29.0%
Free Methodist Church of North America Evangelical Protestant -7 -11,417 -66.0%
Church of God (Anderson, Indiana) Evangelical Protestant -9 -16,615 -62.0%
Church of the Nazarene Evangelical Protestant -10 -10,627 -22.0%
Churches of Christ Evangelical Protestant -12 -2,299 -7.0%
Church of God (Cleveland, Tennessee) Evangelical Protestant -12 +5,905 48.0%
Evangelical Lutheran Church in America Mainline Protestant -20 -39,828 -12.0%
United Church of Christ Mainline Protestant -33 -24,728 -13.0%
Christian Church (Disciples of Christ) Mainline Protestant -34 -16,841 -23.0%
Presbyterian Church (U.S.A.) Mainline Protestant -44 -60,062 -31.0%
Catholic Church Catholic -109 +274,228 8.0%
United Methodist Church, The Mainline Protestant -146 -140,224 -28.0%
  Totals: 468 +424,344 +6.8%

The population of these 102 counties (or equivalents) in 1980 was 11,426,518; in 2000 it was 12,419,293. The total population changed 8.6%. The adherent totals for 1980 (6,250,249) represent 54.7% of the 1980 population. The adherent totals for 2000 (6,867,100) include 55.3% of the 2000 population. There is sufficient data for 78 groups to calculate 1980-2000 change. These 78 groups had 6,219,118 adherents in 1980 and 6,643,462 adherents in 2000, for a change of 6.8%

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]