Whiteside County, Illinois has 100 churches in the Churches List directory, 1 of them verified and 36 with a published website. The 2020 US Religion Census counted 102 congregations and 34,999 adherents across 35 religious bodies in the county. That is 628 adherents per 1,000 residents of its 55,694 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 9 | 14,314 | 257.0 |
| Non-denominational Christian Churches | 11 | 6,060 | 108.8 |
| United Methodist Church | 12 | 3,157 | 56.7 |
| Reformed Church in America | 7 | 2,387 | 42.9 |
| Evangelical Lutheran Church in America | 6 | 2,233 | 40.1 |
| Lutheran Church--Missouri Synod | 4 | 1,105 | 19.8 |
| Lutheran Congregations in Mission for Christ | 1 | 846 | 15.2 |
| Christian Churches and Churches of Christ | 4 | 679 | 12.2 |
| Church of the Nazarene | 4 | 564 | 10.1 |
| Church of Jesus Christ of Latter-day Saints | 1 | 462 | 8.3 |
| American Baptist Churches in the USA | 4 | 462 | 8.3 |
| Christian Reformed Church in North America | 3 | 407 | 7.3 |
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 (55,694). Largest 12 bodies by adherents shown.
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Directory traditions here: Catholic (14) · Baptist Churches (11) · Methodist (11) · Lutheran (11) · United Methodist (9) · Christian (6) · Reformed Church in America (5) · Other Christian Services (4) · Non-Denominational (3) · Evangelical (3)
Directory listings are mapped to Whiteside 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.