Illinois has 13,817 church listings in the Churches List directory, spread across 1,192 cities and towns. 694 listings are verified, 13,525 include a phone number, and 4,645 publish a website. The 2020 US Religion Census counted 12,150 congregations of 214 religious bodies in Illinois, with 6,509,613 reported adherents across 103 counties. 33 Illinois church buildings hold National Register of Historic Places listings@if ($wayback > 0), and 36 of the state's church websites were already archived by the Internet Archive before 2001@endif.
| Religious body | Congregations | Adherents |
|---|---|---|
| Catholic Church | 991 | 3,099,544 |
| Non-denominational Christian Churches | 1,383 | 589,448 |
| Muslim Estimate | 127 | 473,792 |
| United Methodist Church | 1,121 | 235,045 |
| Southern Baptist Convention | 1,008 | 222,589 |
| Lutheran Church--Missouri Synod | 480 | 182,097 |
| Evangelical Lutheran Church in America | 439 | 162,063 |
| National Missionary Baptist Convention, Inc. | 456 | 161,734 |
| Christian Churches and Churches of Christ | 437 | 137,365 |
| Assemblies of God | 315 | 106,173 |
| United Church of Christ | 320 | 96,617 |
| Jehovah's Witnesses | 394 | 93,798 |
| National Baptist Convention, USA, Inc. | 119 | 83,856 |
| Presbyterian Church (U.S.A.) | 349 | 62,272 |
| Church of God in Christ | 214 | 59,740 |
| Tradition | Listings |
|---|---|
| Baptist Churches | 2,123 |
| Catholic | 1,563 |
| Non-Denominational | 1,429 |
| Lutheran | 1,101 |
| Methodist | 978 |
| United Methodist | 734 |
| Christian | 656 |
| Church of God | 510 |
| Presbyterian | 394 |
| Church of Christ | 332 |
| Church of the Nazarene | 311 |
| Evangelical | 289 |
| Community | 268 |
| Assemblies of God | 266 |
| Brethren | 246 |
Directory figures are live counts from the Churches List database for Illinois (IL) as of June 2026. Congregations and adherents come from the 2020 US Religion Census, a county-level enumeration reported by religious bodies and aggregated here to the state; its methodology differs from a directory count and the two will not match. Historic-register counts join National Register of Historic Places listings to directory churches. Statistics for other states: Texas · California · Pennsylvania · North Carolina · Ohio · Florida · Georgia · New York · Michigan · Tennessee. See also the national statistics page, the Illinois directory, and dataset licensing.