Clay County, Illinois has 51 churches in the Churches List directory, 2 of them verified and 11 with a published website. The 2020 US Religion Census counted 47 congregations and 9,448 adherents across 19 religious bodies in the county. That is 711 adherents per 1,000 residents of its 13,289 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Non-denominational Christian Churches | 2 | 2,740 | 206.2 |
| Christian Churches and Churches of Christ | 12 | 1,981 | 149.1 |
| Southern Baptist Convention | 10 | 1,493 | 112.3 |
| Catholic Church | 2 | 1,290 | 97.1 |
| United Methodist Church | 6 | 701 | 52.8 |
| Lutheran Church--Missouri Synod | 2 | 391 | 29.4 |
| American Baptist Churches in the USA | 1 | 301 | 22.7 |
| Church of the Nazarene | 1 | 192 | 14.4 |
| Church of God (Anderson, Indiana) | 1 | 102 | 7.7 |
| Amish Groups, undifferentiated | 2 | 86 | 6.5 |
| Assemblies of God | 1 | 79 | 5.9 |
| Churches of Christ | 1 | 50 | 3.8 |
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 (13,289). Largest 12 bodies by adherents shown.
Sunday Worship 9:30 a.m. Sunday School 10:45 a.m. Sunday Bible Study 6:00 p.m.
Directory traditions here: Christian (13) · Baptist Churches (9) · United Methodist (6) · Methodist (3) · Church of Christ (3) · Church of God (3) · Church of the Nazarene (2) · Non-Denominational (2) · Lutheran (2) · Reorganized Church of Jesus Christ Of Latter Day Saints (1)
Directory listings are mapped to Clay 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.