Marion County, Illinois has 118 churches in the Churches List directory, 2 of them verified and 29 with a published website. The 2020 US Religion Census counted 106 congregations and 19,354 adherents across 32 religious bodies in the county. That is 513 adherents per 1,000 residents of its 37,736 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Southern Baptist Convention | 21 | 4,526 | 119.9 |
| Christian Churches and Churches of Christ | 13 | 3,311 | 87.7 |
| Non-denominational Christian Churches | 6 | 2,540 | 67.3 |
| Catholic Church | 4 | 1,935 | 51.3 |
| United Methodist Church | 14 | 1,449 | 38.4 |
| Lutheran Church--Missouri Synod | 3 | 1,409 | 37.3 |
| Church of the Nazarene | 1 | 1,207 | 32.0 |
| National Missionary Baptist Convention, Inc. | 2 | 590 | 15.6 |
| Churches of Christ | 6 | 373 | 9.9 |
| Church of Jesus Christ of Latter-day Saints | 1 | 336 | 8.9 |
| United Church of Christ | 2 | 194 | 5.1 |
| Presbyterian Church (U.S.A.) | 3 | 193 | 5.1 |
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 (37,736). Largest 12 bodies by adherents shown.
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Directory traditions here: Baptist Churches (26) · Christian (15) · Methodist (12) · United Methodist (11) · Non-Denominational (10) · Church of God (5) · Lutheran (4) · Church of Christ (4) · Assemblies of God (3) · Presbyterian (3)
Directory listings are mapped to Marion 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.