Jefferson County, Iowa has 36 churches in the Churches List directory, 0 of them verified and 8 with a published website. The 2020 US Religion Census counted 35 congregations and 4,691 adherents across 25 religious bodies in the county. That is 299 adherents per 1,000 residents of its 15,665 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 1 | 1,009 | 64.4 |
| United Methodist Church | 4 | 772 | 49.3 |
| Friends United Meeting | 3 | 449 | 28.7 |
| Evangelical Lutheran Church in America | 2 | 337 | 21.5 |
| Church of Jesus Christ of Latter-day Saints | 1 | 334 | 21.3 |
| Muslim Estimate | 1 | 302 | 19.3 |
| Hindu Yoga and Meditation | 1 | 274 | 17.5 |
| Lutheran Congregations in Mission for Christ | 1 | 202 | 12.9 |
| Non-denominational Christian Churches | 4 | 200 | 12.8 |
| Lutheran Church--Missouri Synod | 1 | 200 | 12.8 |
| Amish Groups, undifferentiated | 1 | 149 | 9.5 |
| American Baptist Churches in the USA | 1 | 144 | 9.2 |
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 (15,665). Largest 12 bodies by adherents shown.
Directory traditions here: Baptist Churches (7) · Non-Denominational (6) · Lutheran (3) · Methodist (2) · Catholic (2) · Quaker (2) · United Methodist (2) · Presbyterian (2) · Seventh Day Adventist (1) · Church of the Nazarene (1)
Directory listings are mapped to Jefferson 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.