Warren County, Iowa has 67 churches in the Churches List directory, 0 of them verified and 25 with a published website. The 2020 US Religion Census counted 67 congregations and 17,106 adherents across 25 religious bodies in the county. That is 326 adherents per 1,000 residents of its 52,398 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 6 | 5,081 | 97.0 |
| United Methodist Church | 13 | 3,630 | 69.3 |
| Non-denominational Christian Churches | 7 | 1,630 | 31.1 |
| Assemblies of God | 1 | 1,425 | 27.2 |
| Evangelical Lutheran Church in America | 3 | 1,092 | 20.8 |
| Lutheran Church--Missouri Synod | 3 | 841 | 16.1 |
| Christian Church (Disciples of Christ) | 4 | 630 | 12.0 |
| Reformed Church in America | 1 | 570 | 10.9 |
| Presbyterian Church (U.S.A.) | 3 | 559 | 10.7 |
| Church of Jesus Christ of Latter-day Saints | 1 | 418 | 8.0 |
| Friends United Meeting | 3 | 326 | 6.2 |
| Southern Baptist Convention | 4 | 280 | 5.3 |
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 (52,398). Largest 12 bodies by adherents shown.
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Directory traditions here: Methodist (12) · Catholic (10) · Lutheran (7) · Baptist Churches (6) · Evangelical (5) · Christian (3) · Non-Denominational (3) · Quaker (3) · Assemblies of God (2) · Church of Christ (2)
Directory listings are mapped to Warren 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.