The U.S. government estimates the total population at 3.1 million (midyear 2021). According to the most recent census, conducted in 2011, Sunni Muslims constitute nearly 57 percent of the population, Roman Catholics 10 percent, members of the AOC 7 percent, and members of the Bektashi Order (a form of Shia Sufism) 2 percent. Other groups include Protestant denominations, Baha’is, Jehovah’s Witnesses, The Church of Jesus Christ of Latter-day Saints, and Jews. Nearly 20 percent of respondents declined to answer an optional census question about religious affiliation. According to Boston University’s 2020 World Religion Database, there are approximately 1.71 million Muslims (59 percent of the population), 1.01 million Christians (38 percent), 73,000 atheists or agnostics (2.5 percent), and 16,000 Baha’is. The World Jewish Congress estimates there are 40-50 Jews.

The U.S. government estimates the total population at 43.6 million (midyear 2021), more than 99 percent of whom are Sunni Muslims following the Maliki school.  Religious groups together constituting less than 1 percent of the population include Christians, Jews, Ahmadi Muslims, Shia Muslims, and a community of Ibadi Muslims who reside principally in the Province of Ghardaia.  Religious leaders estimate there are fewer than 200 Jews.

Christian groups include Roman Catholics, Seventh-day Adventists, Methodists, members of the EPA, Lutherans, the Reformed Church, Anglicans, and an estimated 1,000 Egyptian Coptic Christians.  Religious leaders’ unofficial estimates of the number of Christians range from 20,000 to 200,000.  In 2020, the Christian advocacy nongovernmental organization (NGO) International Christian Concern estimated there were approximately 600,000 Christians.  According to government officials and religious leaders, foreign residents make up most of the Christian population.  Among the Christian population, the proportion of students and immigrants from sub-Saharan Africa without legal status has also increased in recent years.  Christian leaders say citizens who are Christians predominantly belong to Protestant groups.

Christians reside mostly in Algiers and the Provinces of Kabylie, Bejaia, Tizi Ouzou, Annaba, Ouargla, and Oran.

The U.S. government estimates the total population at 86,000 (midyear 2021).  The Andorran government estimates the population at 78,000 (2020 data), including 38,000 citizens and 40,000 other residents, mostly from Spain, France, and Portugal.  The local government does not provide statistics on the size of religious groups, and there is no census data on religious group membership.  In 2019, government officials estimated that 92 percent of the population was Roman Catholic.  Muslim leaders estimate their community, largely composed of recent immigrants, has approximately 2,000 members.  The Jewish community reports it has approximately 100 members.  Other small religious groups include Hindus, Anglicans, Seventh-day Adventists, the Baha’i Faith, the Family Federation for World Peace and Unification, the New Apostolic Church, The Church of Jesus Christ of Latter-day Saints, and Jehovah’s Witnesses.