Decatur County, Iowa has 35 churches in the Churches List directory, 0 of them verified and 1 with a published website. The 2020 US Religion Census counted 33 congregations and 2,355 adherents across 16 religious bodies in the county. That is 308 adherents per 1,000 residents of its 7,640 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Amish Groups, undifferentiated | 4 | 415 | 54.3 |
| United Methodist Church | 7 | 380 | 49.7 |
| Catholic Church | 2 | 280 | 36.6 |
| Non-denominational Christian Churches | 1 | 260 | 34.0 |
| Christian Churches and Churches of Christ | 1 | 242 | 31.7 |
| Beachy Amish-Mennonite Churches | 1 | 148 | 19.4 |
| Southern Baptist Convention | 2 | 130 | 17.0 |
| Assemblies of God | 4 | 117 | 15.3 |
| Jehovah's Witnesses | 1 | 110 | 14.4 |
| Biblical Mennonite Alliance | 1 | 62 | 8.1 |
| Churches of Christ | 1 | 50 | 6.5 |
| Lutheran Church--Missouri Synod | 1 | 50 | 6.5 |
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 (7,640). Largest 12 bodies by adherents shown.
Directory traditions here: Methodist (8) · United Methodist (4) · Baptist Churches (4) · Assemblies of God (3) · Catholic (3) · Church of Christ (2) · Church of Jesus Christ Of Latter Day Saints (2) · Brethren (1) · Apostolic (1) · Reorganized Church of Jesus Christ Of Latter Day Saints (1)
Church registers are among the richest genealogical sources: baptisms, marriages, and burials often predate civil records. The FamilySearch catalog holds microfilmed church records for many Iowa counties, filed by denomination and parish name: search Decatur County church records on FamilySearch (free account). Cross-reference with the historic-register churches above and the cemeteries listed on each church's page.
FEMA has issued 14 disaster declarations covering Decatur County since records began in 1953, most recently in 2020. The most frequent cause: flood (6 declarations). Churches have historically served as shelters and relief hubs in these events; congregations can register preparedness plans with their county emergency management agency.
Source: OpenFEMA Disaster Declarations Summaries.
Directory listings are mapped to Decatur 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.