Religion Statistics
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AdherentsWorld-wide religion statistics by country, state, & province
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ARDA - The Association of Religion Data ArchivesThe best religion statistics resource providing quantitative data on aspects of American religion, such as church membership, clergy, congregations, and denominations on the national, state, and county levels
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Barna GroupResearch on religious topics, such as faith/spirituality, leadership, transformation, etc.
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Spirit and Power: A 10-Country Survey of PentecostalsFrom the Pew Research Center, with the support of the John Templeton Foundation
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Statistical Abstract of the United StatesPopulation, marriage & divorce, crime, religious population of the world
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US Census BureauPopulation Estimates by State, County & Metropolitan Area, Census 2010
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World Christian DatabaseThrough the Center for the Study of Global Christianity and the Gordon-Conwell Theological Seminary. Contains detailed information on 34,000 Christian denominations & on religions in every country of the world
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Statista This link opens in a new window
One of the most successful statistics databases in the world. Over 1,000,000 statistics on more than 80,000 topics. Also provides market forecasts, industry reports, and consumer market outlooks.