Detailed county-level data on the number and of religious congregations and the number of members by church type is available free online. The data includes twelve major religions (i.e. Roman Catholic, Hindu, Islamic, Pentecostal) and 233 specific religious groups (i.e. Evangelical Methodist Church, Christian Science Churches, and Baha’i Faith). A new map-based exploration tool is also available.
The data is provided free by Social Explorer, an online data source developed to help users analyze and understand demographic trends and social change. Social Explorer utilizes data on religion compiled by Infogroup. The data is collected by Infogroup from the yellow pages and other sources and is verified and enhanced by telephoning every congregation in the US. The data can be downloaded into Excel.
Sample report for Ashland County, Wisconsin.