St. Mary's County, Maryland has 82 churches in the Churches List directory, 1 of them verified and 40 with a published website. The 2020 US Religion Census counted 88 congregations and 50,430 adherents across 35 religious bodies in the county. That is 443 adherents per 1,000 residents of its 113,777 people.
| Religious body | Congregations | Adherents | Per 1,000 pop. |
|---|---|---|---|
| Catholic Church | 17 | 25,162 | 221.2 |
| United Methodist Church | 9 | 10,699 | 94.0 |
| Non-denominational Christian Churches | 10 | 3,530 | 31.0 |
| Episcopal Church | 7 | 1,449 | 12.7 |
| Church of Jesus Christ of Latter-day Saints | 2 | 1,180 | 10.4 |
| Wesleyan Church | 1 | 1,043 | 9.2 |
| Southern Baptist Convention | 5 | 729 | 6.4 |
| Muslim Estimate | 1 | 716 | 6.3 |
| National Missionary Baptist Convention, Inc. | 1 | 700 | 6.2 |
| Presbyterian Church (U.S.A.) | 1 | 647 | 5.7 |
| Stauffer Mennonite Church | 2 | 623 | 5.5 |
| Amish Groups, undifferentiated | 4 | 549 | 4.8 |
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 (113,777). Largest 12 bodies by adherents shown.
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Directory traditions here: Catholic (18) · Episcopal (10) · Baptist Churches (9) · Methodist (8) · Non-Denominational (7) · Presbyterian (4) · Bible (4) · Church of the Nazarene (3) · Church of God (3) · United Methodist (3)
Directory listings are mapped to St. Mary's 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.