Grundy County, Iowa has 40 churches in the Churches List directory, 0 of them verified and 9 with a published website. The 2020 US Religion Census counted 32 congregations and 6,054 adherents across 15 religious bodies in the county. That is 491 adherents per 1,000 residents of its 12,326 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| United Methodist Church | 7 | 1,709 | 138.7 |
| Evangelical Lutheran Church in America | 3 | 926 | 75.1 |
| Catholic Church | 1 | 823 | 66.8 |
| Presbyterian Church (U.S.A.) | 5 | 626 | 50.8 |
| United Church of Christ | 1 | 564 | 45.8 |
| Reformed Church in America | 3 | 364 | 29.5 |
| Presbyterian Church in America | 2 | 359 | 29.1 |
| Christian Reformed Church in North America | 1 | 207 | 16.8 |
| Lutheran Church--Missouri Synod | 2 | 193 | 15.7 |
| Church of the Brethren | 1 | 149 | 12.1 |
| Assemblies of God | 1 | 101 | 8.2 |
| United Reformed Churches in North America | 1 | 33 | 2.7 |
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 (12,326). Largest 12 bodies by adherents shown.
Directory traditions here: Catholic (6) · Methodist (5) · Brethren (4) · Baptist Churches (4) · Lutheran (4) · United Methodist (4) · Other Christian Services (3) · Presbyterian (3) · Evangelical (2) · Assemblies of God (2)
Directory listings are mapped to Grundy 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.