Adherents.com

Adherents.com is 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, and movements around the world. It presents data from both primary research sources such as government census reports, statistical sampling surveys, and organizational reporting, as well as citations from secondary literature which mention adherent statistics. The site’'s main feature is an alphabetized list of religious groups, ranging from the Aaronic Order to Zurvanism. Clicking on individual religions reveals statistics on number and population percentages of adherents in the countries where they are located, as well as numbers of congregations and units within the denomination. Adherents.com is an Internet initiative and not affiliated with any religious, political, or educational organization; it claims to be the web's second most frequently visited general religion site.