Iroquois County, Illinois has 78 churches in the Churches List directory, 0 of them verified and 12 with a published website. The 2020 US Religion Census counted 67 congregations and 11,681 adherents across 24 religious bodies in the county. That is 431 adherents per 1,000 residents of its 27,082 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Lutheran Church--Missouri Synod | 10 | 3,397 | 125.4 |
| United Methodist Church | 12 | 1,905 | 70.3 |
| Catholic Church | 7 | 1,869 | 69.0 |
| Christian Churches and Churches of Christ | 8 | 1,447 | 53.4 |
| Evangelical Lutheran Church in America | 3 | 857 | 31.6 |
| Association of Free Lutheran Congregations | 2 | 449 | 16.6 |
| Non-denominational Christian Churches | 3 | 440 | 16.2 |
| United Church of Christ | 3 | 438 | 16.2 |
| Apostolic Christian Church of America | 1 | 200 | 7.4 |
| Church of the Nazarene | 3 | 140 | 5.2 |
| Jehovah's Witnesses | 1 | 136 | 5.0 |
| Reformed Church in America | 1 | 127 | 4.7 |
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 (27,082). Largest 12 bodies by adherents shown.
Sunday morning worship at 9:30 a.m. and evening worship at 6:30 p.m. Youth meet at 5:30 p.m. on Sunday.
Directory traditions here: Lutheran (14) · Methodist (12) · Catholic (9) · United Methodist (8) · Church of the Nazarene (6) · Baptist Churches (5) · Non-Denominational (5) · Christian (4) · Other Christian Services (3) · Church of Christ (3)
Directory listings are mapped to Iroquois 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.