Rock Island County, Illinois has 193 churches in the Churches List directory, 1 of them verified and 82 with a published website. The 2020 US Religion Census counted 169 congregations and 45,719 adherents across 51 religious bodies in the county. That is 316 adherents per 1,000 residents of its 144,667 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 13 | 14,509 | 100.3 |
| United Methodist Church | 14 | 2,924 | 20.2 |
| Evangelical Lutheran Church in America | 10 | 2,827 | 19.5 |
| Lutheran Church--Missouri Synod | 8 | 2,826 | 19.5 |
| National Baptist Convention, USA, Inc. | 3 | 2,250 | 15.6 |
| Non-denominational Christian Churches | 14 | 2,114 | 14.6 |
| United Church of Christ | 3 | 1,751 | 12.1 |
| Church of Jesus Christ of Latter-day Saints | 3 | 1,386 | 9.6 |
| Assemblies of God | 7 | 1,332 | 9.2 |
| Foursquare Gospel, International Church of the | 4 | 1,130 | 7.8 |
| American Baptist Churches in the USA | 6 | 1,092 | 7.5 |
| Presbyterian Church (U.S.A.) | 8 | 1,087 | 7.5 |
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 (144,667). Largest 12 bodies by adherents shown.
Directory traditions here: Baptist Churches (33) · Catholic (27) · Non-Denominational (20) · Lutheran (20) · Methodist (12) · United Methodist (10) · Presbyterian (7) · Church of the Nazarene (7) · Evangelical (6) · Christian (6)
Directory listings are mapped to Rock Island 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.