The U.S. Religion Census is a count of religious congregations, and where available, the number of people affiliated (adherents) with those congregations. The 2020 U.S. Religion Census has data on 372 religious bodies across the nation. The material on the website includes counts of congregations and adherents for each of the 372 groups in every county (or county equivalent) in the United States. This data is available in report form and in maps, and the entire dataset can be downloaded in spreadsheet format.
The links below are to PDF files with information on how the 2020 U.S. Religion Census data was collected. The Preface and Introduction provide an overview of the study's methodology and summarizes participation. Appendix A contains basic information for each of the groups listed in the study. Appendices B through K describe special efforts to count various groups.
Appendix A--Definitions, Procedures, and Comments
Appendix B--Non-denominational Christian Churches
Appendix D--African American Groups
Appendix E--Mailing Address Lists
Appendix F--Orthodox Christian Groups
Appendix J--Plain Anabaptist Groups