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The United States Catholic Historical Society

U.S. Congregational Membership: State Maps

From the Association of Religion Data Archives (ARDA).

U.S. Religion Census 1952 to 2010| Religious Statistics & Demographics

The U.S. Religion Census is your source for religious data at the county level. It reports the number of congregations in every U.S. county equivalent for each of 236 faith groups. This is an update of the 1952, 1971, 1980, 1990, and 2000 studies originally done by the National Council of Churches and the Glenmary Research Center.