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Section I. Religious Demography

The U.S. government estimates the total population at 10.4 million (July 2018 estimate).  According to the 2011 census, more than 80 percent of the population older than 15 is Roman Catholic.  Other religious groups, each constituting less than 1 percent of the population, include Orthodox Christians; various Protestant and other Christian denominations, including the Seventh-day Adventist Church, Lutheran Church of Portugal, Universal Church of Jesus Christ, New Apostolic Church, Portuguese Evangelical Methodist Church, and The Church of Jesus Christ of Latter-day Saints (Church of Jesus Christ); and Muslims, Hindus, Jews, Buddhists, Taoists, Zoroastrians, and Baha’is.  Approximately 6.8 percent of the population said it does not belong to any religious group, and 8.2 percent did not answer the question.  According to the census, mainline Protestants number more than 75,000 persons, and there are more than 163,000 members of other Christian denominations, including evangelicals.  According to the census, there are more than 56,000 members of the Eastern Orthodox Church, most of whom are immigrants from Eastern Europe, primarily from Ukraine, and approximately 3,000 Jews.  The Muslim community estimates there are 50,000 Muslims.

International Religious Freedom Reports
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U.S. Department of State

The Lessons of 1989: Freedom and Our Future