Union County, Illinois has 39 churches in the Churches List directory, 0 of them verified and 9 with a published website. The 2020 US Religion Census counted 50 congregations and 7,698 adherents across 20 religious bodies in the county. That is 447 adherents per 1,000 residents of its 17,239 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Southern Baptist Convention | 20 | 5,432 | 315.1 |
| Evangelical Lutheran Church in America | 2 | 390 | 22.6 |
| Christian Churches and Churches of Christ | 1 | 357 | 20.7 |
| Catholic Church | 1 | 300 | 17.4 |
| United Methodist Church | 6 | 262 | 15.2 |
| Eastern Pennsylvania Mennonite Church | 1 | 179 | 10.4 |
| Church of the Nazarene | 1 | 156 | 9.0 |
| Lutheran Congregations in Mission for Christ | 2 | 102 | 5.9 |
| Cumberland Presbyterian | 3 | 88 | 5.1 |
| Non-denominational Christian Churches | 1 | 80 | 4.6 |
| African Methodist Episcopal Church | 1 | 76 | 4.4 |
| Lutheran Church--Missouri Synod | 1 | 69 | 4.0 |
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 (17,239). Largest 12 bodies by adherents shown.
Directory traditions here: Baptist Churches (12) · Pentecostal (5) · United Methodist (3) · Methodist (3) · Lutheran (3) · Christian (2) · Church of Christ (2) · Catholic (2) · Assemblies of God (2) · Church of the Nazarene (1)
Directory listings are mapped to Union 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.