Sioux County, Iowa has 68 churches in the Churches List directory, 2 of them verified and 34 with a published website. The 2020 US Religion Census counted 81 congregations and 26,776 adherents across 25 religious bodies in the county. That is 747 adherents per 1,000 residents of its 35,863 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Reformed Church in America | 17 | 11,042 | 307.9 |
| Christian Reformed Church in North America | 19 | 7,408 | 206.6 |
| Catholic Church | 6 | 3,318 | 92.5 |
| Lutheran Church--Missouri Synod | 4 | 1,370 | 38.2 |
| Protestant Reformed Churches in America | 2 | 756 | 21.1 |
| Evangelical Lutheran Church in America | 3 | 623 | 17.4 |
| United Reformed Churches in North America | 3 | 536 | 14.9 |
| United Methodist Church | 3 | 439 | 12.2 |
| Lutheran Congregations in Mission for Christ | 2 | 280 | 7.8 |
| American Baptist Churches in the USA | 1 | 215 | 6.0 |
| Christian and Missionary Alliance | 1 | 202 | 5.6 |
| Presbyterian Church in America | 2 | 124 | 3.5 |
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 (35,863). Largest 12 bodies by adherents shown.
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Motivated by God's love for us and a hurting world, Trinity Church seeks to teach of God and be equipped to serve others to the praise of God.
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Directory traditions here: Other Christian Services (23) · Lutheran (11) · Catholic (7) · Christian (6) · Methodist (3) · Baptist Churches (3) · Presbyterian (3) · Community (3) · United Methodist (2) · Reformed Church in America (2)
Directory listings are mapped to Sioux 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.