St. Clair County, Missouri has 19 churches in the Churches List directory, 0 of them verified and 1 with a published website. The 2020 US Religion Census counted 31 congregations and 4,713 adherents across 12 religious bodies in the county. That is 508 adherents per 1,000 residents of its 9,283 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Southern Baptist Convention | 9 | 2,961 | 319.0 |
| Christian Churches and Churches of Christ | 5 | 391 | 42.1 |
| Amish Groups, undifferentiated | 3 | 373 | 40.2 |
| United Methodist Church | 4 | 333 | 35.9 |
| Catholic Church | 1 | 200 | 21.5 |
| Assemblies of God | 1 | 135 | 14.5 |
| Lutheran Church--Missouri Synod | 1 | 129 | 13.9 |
| United Church of Christ | 1 | 105 | 11.3 |
| Church of the Brethren | 1 | 53 | 5.7 |
| Church of the Nazarene | 2 | 33 | 3.6 |
| Christian Church (Disciples of Christ) | 2 | 0 | 0.0 |
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 (9,283). Largest 12 bodies by adherents shown.
Directory traditions here: Christian (5) · Methodist (4) · Lutheran (2) · Baptist Churches (2) · Church of God (2) · Evangelical (1) · Catholic (1) · Assemblies of God (1) · United Methodist (1)
Directory listings are mapped to St. Clair 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.