...the latest findings, best methods and newest ideas in the scientific study of religion.

Tools and resources from across the ARDA to help in your research:

Site Tutorials

Use our Site tutorials to learn how to use the ARDA's tools and features to support your research.

Religious Groups

Review the lineage and membership trends of over 600 religious groups, or view a denominational family tree.

Data Archive

Browse the over 825 data files included in the ARDA collection. You can preview the results, read about how the data were collected, review the survey questions asked, save selected survey questions to your own file, or download the data file.

Frequently Asked Questions

Go to the FAQ to see the answers to questions frequently asked of ARDA staff.

Maps and Reports

View maps and reports of the United States and individual states for hundred of variables, including congregational membership, census data, crime statistics and many others.

National Profiles

Offering information on most countries of the world, the profiles include data on religious adherents, religious freedoms, demographics, and other social measures for each nation and their region.


Using the best available data, QuickLists provides data on American and international religion in rank order.


Browse dozens of topics and see reponses from major national surveys, demographic patterns, and changes over time!

Related Sites for Researchers

Browse external resources such as research journals, scholarly associations and other data archives.

Sociology of Religion Searchable Biblographic Database

Searchable set of over 18,000 citations provided by Anthony J. Blasi (Ph.D. in Sociology, University of Notre Dame; University of Texas at San Antonio).