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"a growing collection of over 43,870 adherent statistics and religious geography citations: references to published membership/adherent statistics and congregation statistics for over 4,200 religions, churches, denominations, religious bodies, faith groups, tribes, cultures, movements, ultimate concerns, etc. The religions of the world are enumerated here."
U.S. Demographic Maps, Census 1790-2010 -- "over 15,000 demographic and socio-economic maps of the United States between 1790 and 2010"
U.S. Religion Maps
Religion 2009 & 2010 -- "Infogroup provides the most complete and accurate database of churches and religious associated businesses with approximately 350,000 houses of worship."
Religion 1980-2010 -- "Based on the Religious Congregations and Membership Study (RCMS), this is the most complete census available on religion in the United States."
Churches by Faith, 1850-1870 -- included in Decennial Census counts