Marshall County, Iowa has 71 churches in the Churches List directory, 3 of them verified and 28 with a published website. The 2020 US Religion Census counted 59 congregations and 21,351 adherents across 29 religious bodies in the county. That is 532 adherents per 1,000 residents of its 40,106 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 2 | 9,246 | 230.5 |
| Christian Churches and Churches of Christ | 2 | 2,608 | 65.0 |
| United Methodist Church | 8 | 2,303 | 57.4 |
| Evangelical Lutheran Church in America | 4 | 1,464 | 36.5 |
| Lutheran Church--Missouri Synod | 4 | 1,138 | 28.4 |
| Non-denominational Christian Churches | 4 | 820 | 20.4 |
| Friends United Meeting | 3 | 610 | 15.2 |
| Presbyterian Church (U.S.A.) | 3 | 519 | 12.9 |
| United Church of Christ | 5 | 446 | 11.1 |
| National Association of Congregational Christian Churches | 2 | 360 | 9.0 |
| Church of Jesus Christ of Latter-day Saints | 1 | 334 | 8.3 |
| Jehovah's Witnesses | 2 | 322 | 8.0 |
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 (40,106). Largest 12 bodies by adherents shown.
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Directory traditions here: Lutheran (8) · Methodist (7) · United Methodist (7) · Church of Christ (6) · Catholic (5) · Baptist Churches (5) · Brethren (4) · Evangelical (3) · Presbyterian (2) · Bible (2)
Directory listings are mapped to Marshall 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.