Catholics in the U.S. Religion Census
Clifford A. Grammich. U.S. Religion Census
For more than a century, the Catholic Church has been the single-largest religious body in the United
States. Its number of adherents, more than 60 million, accounts for roughly 20 percent of the U.S.
population and nearly 40 percent of adherents in the U.S. Religion Census. In 2020, it had nearly 20,000
U.S. congregations—the fourth-most of all religious bodies in the Religion Census. It was also present in
nearly 3,000 counties—the second-most number of counties of all religious bodies in the Religion
Census.