Association of Religion Data ArchivesStatistics on religious bodies in the U.S. and internationally. Data varies by location.
Figures for U.S. denominations in the U.S. can be had at the state, county, and zip code level for 1980, 1990, and 2000 while profiles for the entire denomination can include more historic data. Statistics on religious adherents are available for entire countries along with various socio-economic measures. GIS Maps are available, and it is possible to cross-reference geographies with practices. Downloadable datasets allow users to work with data independently of the site. A research-oriented site, the ARDA includes much information of use to educators, journalists, religious workers, and the general public.