Religion
- ARDA - Association of Religion Data ArchivesData on many aspects of American religion including church membership, clergy, congregations, and denominations on the national, state, and county levels.
- U.S. Religious Landscape SurveyBased on interviews with more than 35,000 American adults, this extensive survey by the Pew Forum on Religion & Public Life details the religious makeup, religious beliefs and practices as well as social and political attitudes of the American public.
- The Global Catholic PopulationSummary of Pew Research findings on the global Catholic Population.