DeKalb County, Illinois has 126 churches in the Churches List directory, 2 of them verified and 62 with a published website. The 2020 US Religion Census counted 108 congregations and 53,444 adherents across 37 religious bodies in the county. That is 532 adherents per 1,000 residents of its 100,422 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 7 | 25,409 | 253.0 |
| Muslim Estimate | 1 | 4,326 | 43.1 |
| Evangelical Lutheran Church in America | 6 | 4,231 | 42.1 |
| United Methodist Church | 12 | 4,021 | 40.0 |
| Non-denominational Christian Churches | 13 | 3,280 | 32.7 |
| Assemblies of God | 3 | 2,130 | 21.2 |
| United Church of Christ | 8 | 1,630 | 16.2 |
| Lutheran Church--Missouri Synod | 4 | 1,498 | 14.9 |
| Church of Jesus Christ of Latter-day Saints | 3 | 1,386 | 13.8 |
| American Baptist Churches in the USA | 3 | 1,255 | 12.5 |
| Jehovah's Witnesses | 5 | 930 | 9.3 |
| National Missionary Baptist Convention, Inc. | 1 | 700 | 7.0 |
Source: 2020 US Religion Census (Association of Statisticians of American Religious Bodies). Per-1,000 rates divide reported adherents by the county's 2020 Census population (100,422). Largest 12 bodies by adherents shown.
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Directory traditions here: Non-Denominational (17) · Lutheran (15) · Baptist Churches (15) · Catholic (10) · Methodist (8) · United Methodist (7) · United Church of Christ (6) · Church of the Nazarene (4) · Church of Christ (4) · Christian (3)
Directory listings are mapped to DeKalb County through the US Census Bureau's 2020 ZCTA-to-county relationship file: each ZIP Code Tabulation Area is assigned to the county holding the largest share of its land area, so a small number of churches in ZIP codes that straddle county lines may be attributed to a neighboring county. Congregation and adherent counts come from the 2020 US Religion Census and are reported by the religious bodies themselves. Population is the county's April 2020 decennial-census base from the US Census Bureau's population-estimates program; per-1,000 adherence rates divide reported adherents by that figure. Corrections to any listing go through the corrections page.