Where to Find Local Data: The U.S. Religion Census
Gemini:
The most comprehensive source for county-level data is the U.S. Religion Census, which is compiled every 10 years by the Association of Statisticians of American Religious Bodies (ASARB) and hosted online by the Association of Religion Data Archives (ARDA).
Rather than polling individuals, this study gathers membership numbers directly from congregations and religious bodies.
Brown County, Indiana Religious Affiliation Data
According to the most recent data (2020), Brown County had an official population of 15,475. Out of that total, 4,556 individuals (or 29.4%) were reported as active adherents/members of a specific local congregation. The remaining 70.6% are considered religiously unaffiliated or attend services outside documented county lines.
The breakdown of the largest participating religious groups in Brown County includes:
