The ARDA tools and features listed here may help students interested in researching religion.

American and World Religions

Review the lineage and membership trends of more than 600 religious groups or view a religious family tree. [Tutorial Available]

Data Archive

Browse more than 1,000 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. [Tutorial Available]

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 hundreds 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. [Tutorial Available]


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


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

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