Clarke County, Iowa has 16 churches in the Churches List directory, 1 of them verified and 3 with a published website. The 2020 US Religion Census counted 21 congregations and 4,168 adherents across 16 religious bodies in the county. That is 427 adherents per 1,000 residents of its 9,754 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Non-denominational Christian Churches | 4 | 950 | 97.4 |
| Catholic Church | 1 | 895 | 91.8 |
| United Methodist Church | 1 | 819 | 84.0 |
| Christian Churches and Churches of Christ | 2 | 400 | 41.0 |
| Assemblies of God | 1 | 250 | 25.6 |
| Amish Groups, undifferentiated | 1 | 213 | 21.8 |
| Church of Jesus Christ of Latter-day Saints | 1 | 209 | 21.4 |
| Christian Church (Disciples of Christ) | 2 | 206 | 21.1 |
| Lutheran Church--Missouri Synod | 1 | 109 | 11.2 |
| Churches of Christ | 1 | 40 | 4.1 |
| Seventh-day Adventist Church | 1 | 40 | 4.1 |
| Southern Baptist Convention | 1 | 37 | 3.8 |
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 (9,754). Largest 12 bodies by adherents shown.
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Directory traditions here: Christian (2) · Baptist Churches (2) · Assemblies of God (2) · Catholic (2) · Methodist (1) · Lutheran (1) · Reorganized Church of Jesus Christ Of Latter Day Saints (1) · United Methodist (1) · Bible (1) · Presbyterian (1)
Directory listings are mapped to Clarke 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.