Hamilton County, Iowa has 37 churches in the Churches List directory, 1 of them verified and 8 with a published website. The 2020 US Religion Census counted 35 congregations and 7,476 adherents across 19 religious bodies in the county. That is 497 adherents per 1,000 residents of its 15,037 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Evangelical Lutheran Church in America | 3 | 1,708 | 113.6 |
| United Methodist Church | 7 | 1,346 | 89.5 |
| Catholic Church | 2 | 1,050 | 69.8 |
| Lutheran Congregations in Mission for Christ | 4 | 720 | 47.9 |
| United Church of Christ | 3 | 551 | 36.6 |
| Lutheran Church--Missouri Synod | 1 | 443 | 29.5 |
| Christian and Missionary Alliance | 1 | 426 | 28.3 |
| Non-denominational Christian Churches | 2 | 400 | 26.6 |
| Christian Churches and Churches of Christ | 2 | 304 | 20.2 |
| Association of Free Lutheran Congregations | 2 | 176 | 11.7 |
| Assemblies of God | 1 | 136 | 9.0 |
| Christian Church (Disciples of Christ) | 1 | 120 | 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 (15,037). Largest 12 bodies by adherents shown.
Directory traditions here: Lutheran (8) · Methodist (7) · Catholic (4) · United Methodist (3) · Baptist Churches (3) · Episcopal (2) · Church of Christ (2) · Non-Denominational (1) · Other Christian Services (1) · Christian (1)
Directory listings are mapped to Hamilton 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.