County rankings from the 2020 U.S. Religion Census, PRRI's Census of American Religion and the Census Bureau's ACS.
Where evangelicals lead
2,144
of the nation's 3,143 counties count more evangelical adherents than Catholic ones.
Bell County, KY76.4%
Simpson County, MS72.3%
Holmes County, OH72.1%
Many faiths, one county
0.886
Montgomery County, MD, is the most religiously diverse county in America. The county average is 0.615.
Kings County (Brooklyn), NY0.883
Nassau County, NY0.876
Montgomery County, PA0.873
Frontiers of secularization
89.8%
of Orange County, VT, residents are on no congregation's rolls, the lowest adherence of any county of 20,000+.
The field in numbers
4.9 million
people in Los Angeles County are on no congregation's rolls, more than in any other county.
Cook County, IL2.41 million
Maricopa County, AZ2.33 million
Harris County, TX1.95 million
Cross-cultural mission at home
54.5%
of Miami-Dade County, FL, residents were born abroad, the highest share of any county of 20,000+.
Fewest churches per person
2,759
people per congregation in Ocean County, NJ, the thinnest church presence of any county of 20,000+.
Kendall County, IL2,747
Bronx County, NY2,526
Clark County, NV2,382
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Adherents and unclaimed: 2020 U.S. Religion Census (ASARB), counts of people tied to reporting congregations; "unclaimed" means not counted by any of them, not "no religion." Evangelical and Catholic totals follow ARDA's tradition classification. Diversity and unaffiliated shares: 2023 PRRI Census of American Religion (adults). Foreign-born and Native American (alone) shares: ACS 2020–2024 5-year estimates, U.S. Census Bureau. Percentage rankings use counties of 20,000 residents or more; Native American share uses 5,000 or more. Congregations per person: 2020 U.S. Religion Census. Puerto Rico not included.