Mercer County, Ohio has 81 churches in the Churches List directory, 0 of them verified and 24 with a published website. The 2020 US Religion Census counted 76 congregations and 32,987 adherents across 21 religious bodies in the county. That is 775 adherents per 1,000 residents of its 42,539 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 22 | 22,244 | 522.9 |
| Non-denominational Christian Churches | 9 | 4,430 | 104.1 |
| United Methodist Church | 12 | 1,989 | 46.8 |
| Evangelical Lutheran Church in America | 4 | 1,450 | 34.1 |
| Churches of God, General Conference | 4 | 652 | 15.3 |
| National Missionary Baptist Convention, Inc. | 2 | 450 | 10.6 |
| Church of the United Brethren in Christ USA | 1 | 324 | 7.6 |
| Church of the Nazarene | 2 | 323 | 7.6 |
| United Church of Christ | 1 | 293 | 6.9 |
| Amish Groups, undifferentiated | 7 | 153 | 3.6 |
| Christian Churches and Churches of Christ | 1 | 126 | 3.0 |
| Jehovah's Witnesses | 1 | 116 | 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 (42,539). Largest 12 bodies by adherents shown.
A Bible Centered Evangelical Anabaptist Church.
Directory traditions here: Catholic (20) · Methodist (10) · United Methodist (7) · Non-Denominational (7) · Church of God (6) · Church of Christ (4) · Lutheran (4) · Brethren (4) · Church of the Nazarene (3) · Baptist Churches (3)
Directory listings are mapped to Mercer 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.