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   Association of Statisticians 
   of American Religious Bodies
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Member groups supply adherent totals each year. These are available in an Excel spreadsheet to interested parties.
Association of Statisticians of American Religious Bodies Projects
Many member groups report adherents in broad cultural categories, consistent with U.S. census practices. These are available in Excel. 
The only county-level count of religious congregations available nationally, ASARB has sponsored this decadal study since the mid-1980s. 
Statisticians have their own code phrases that need interpretation. ASARB has compiled a list of some common abbreviations used in our meetings.
Reliable, useful, consistent data is the aim of ASARB members.
Yearbook of American and Canadian Churches

The Yearbook has been on hiatus for a several years. ASARB is now working other organizations in the hope of again having an annual collection and dissemination of religion data for religious groups in these two countries.