Hartford Institute for Religion Research
Provides information about various research projects in the sociological study of religion, including issues on women and religion, congregations, religion and the family, etc.
Pew Research Center: Religion
Includes all research reports done by the center on major religious traditions around the world.
The Pluralism Project
Studies and interprets the changing religious landscape of the US. Includes field research on religious diversity and interfaith relations that informs the development of key educational resources. Sponsored by Harvard University.
Religious Congregations & Membership Study 2010
A county-by-county enumeration of religious bodies in the United States, is the latest in a series of every-10-year studies conducted at the same time as the U.S. census.
U.S. Religious Landscape Survey
Conducted in 2007 and 2014, surveys more than 35,000 Americans from all 50 states about their religious affiliations, beliefs and practices, and social and political views.