Illinois: Cook
| Denomination | Members | Adherents | Attendees |
| Albanian Orthodox Diocese of America | 250 | 270 | |
| American Baptist Association, The | 50 | 63 | |
| American Baptist Churches in the USA | 17353 | 21825 | 6163 |
| American Carpatho-Russian Orthodox Greek Catholic Church | 122 | 207 | |
| Antiochian Orthodox Christian Archdiocese of North America, The | 714 | 1428 | |
| Apostolic Christian Church of America, Inc. | 115 | 175 | 175 |
| Armenian Apostolic Church / Catholicossate of Cilicia | 165 | 980 | |
| Armenian Apostolic Church / Catholicossate of Etchmiadzin | 307 | 3688 | |
| Assemblies of God | 8379 | 14013 | 10081 |
| Bahá'í | 2505 | 2505 | |
| Baptist General Conference | 6796 | 9353 | 7092 |
| Baptist Missionary Association of America | 67 | 84 | 45 |
| Buddhism | |||
| Bulgarian Orthodox Diocese of the USA | 900 | ||
| Catholic Church | 2146961 | ||
| Calvary Chapel Fellowship Churches | |||
| Christian and Missionary Alliance, The | 2050 | 2884 | |
| Christian Church (Disciples of Christ) | 2501 | 3146 | 399 |
| Christian Churches and Churches of Christ | 4191 | 5272 | |
| Christian Reformed Church in North America | 9741 | 12251 | 6899 |
| Church of God (Anderson, Indiana) | 3408 | 3408 | |
| Church of God (Cleveland, Tennessee) | 3868 | 4995 | 2361 |
| Church of God of Prophecy | 169 | 212 | |
| Church of Jesus Christ of Latter-day Saints, The | 8862 | ||
| Church of the Brethren | 506 | 637 | 95 |
| Church of the Nazarene | 3124 | 3861 | 2382 |
| Churches of Christ | 5789 | 7614 | 4865 |
| Community of Christ | 329 | 329 | |
| National Association of Congregational Christian Churches | 830 | 1044 | 440 |
| Conservative Baptist Association of America | 3220 | 3220 | |
| Conservative Congregational Christian Conference | 188 | 236 | 55 |
| Cumberland Presbyterian Church | 41 | 53 | |
| Episcopal Church | 22255 | 8794 | |
| Evangelical Covenant Church, The | 7415 | 9841 | 5918 |
| Evangelical Free Church of America, The | 4112 | 8678 | 8653 |
| Evangelical Lutheran Church in America | 47489 | 63421 | 19526 |
| Evangelical Mennonite Church | 41 | 52 | 64 |
| Association of Free Lutheran Congregations, The | 55 | 55 | 20 |
| Free Methodist Church of North America | 131 | 226 | 193 |
| National Association of Free Will Baptists | 172 | 216 | |
| Friends (Quakers) | 479 | 602 | |
| Mennonite Brethren Churches, U.S. Conference of | 11 | 14 | |
| Greek Orthodox Archdiocese of America | 29049 | ||
| Apostolic Catholic Assyrian Church of the East, North American Dioceses | 19650 | ||
| Hindu | |||
| International Council of Community Churches | 6516 | 8196 | |
| International Church of the Foursquare Gospel | 1128 | 1419 | 773 |
| International Churches of Christ | 3179 | 4582 | 4926 |
| Muslim Estimate | 95623 | 18207 | |
| Jain | |||
| Lutheran Church--Missouri Synod | 48302 | 63814 | 21415 |
| Mennonite Church USA | 2281 | 2974 | 2271 |
| Universal Fellowship of Metropolitan Community Churches | 153 | 174 | 157 |
| Missionary Church, The | 170 | 297 | 297 |
| National Primitive Baptist Convention, USA | 532 | 669 | |
| New Testament Association of Independent Baptist Churches and other Fundamental Baptist Associations/Fellowships | 2022 | 2543 | |
| Netherlands Reformed Congregations | 18 | 31 | |
| North American Baptist Conference | 694 | 873 | 455 |
| Macedonian Orthodox Church: American Diocese | 800 | ||
| Orthodox Church in America: Territorial Dioceses | 553 | 2244 | |
| Orthodox Church in America: Bulgarian Diocese | 450 | 1830 | |
| Malankara Orthodox Syrian Church, American Diocese of the | 1000 | ||
| Malankara Archdiocese of the Syrian Orthodox Church in North America | 60 | 300 | |
| Orthodox Presbyterian Church, The | 236 | 374 | 284 |
| Pentecostal Church of God | 47 | 80 | |
| International Pentecostal Holiness Church | 68 | 86 | 78 |
| Presbyterian Church (U.S.A.) | 29336 | 36966 | 15028 |
| Presbyterian Church in America | 1072 | 1403 | 1098 |
| Primitive Baptist Churches--Old Line | |||
| Protestant Reformed Churches in America | 332 | 564 | |
| Reformed Church in America | 5538 | 8818 | 5220 |
| General Association of Regular Baptist Churches | 675 | 849 | 596 |
| Romanian Orthodox Archdiocese in America and Canada | 525 | ||
| Orthodox Church in America: Romanian Orthodox Episcopate of America | 3000 | ||
| Russian Orthodox Church Outside of Russia | |||
| Salvation Army, The | 1983 | 6128 | 2383 |
| Serbian Orthodox Church in the USA | 7500 | ||
| Serbian Orthodox Church in the USA (New Gracanica Metropolitanate) | |||
| Seventh-day Adventist Church | 13046 | 15521 | |
| Sikh | |||
| Southwide Baptist Fellowship | |||
| Southern Baptist Convention | 50158 | 63084 | 22337 |
| Ukrainian Orthodox Church of the USA | 1356 | ||
| Unitarian Universalist Association of Congregations | 2124 | 2671 | |
| United Church of Christ | 41939 | 52747 | 19501 |
| United Methodist Church, The | 33957 | 42712 | 14611 |
| United Reformed Churches in North America | 572 | 775 | |
| Vineyard USA | 968 | 1434 | 1160 |
| Wesleyan Church, The | 316 | 948 | 355 |
| Wisconsin Evangelical Lutheran Synod | 1399 | 1826 | 705 |
| Jewish Estimate | 234400 | ||
| Independent, Charismatic Churches | 3900 | 4775 | 4775 |
| Independent, Non-Charismatic Churches | 5213 | 8027 | 6562 |
- Page last updated on Mar 12, 2007
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