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Section I. Religious Demography

The U.S. government estimates the total population at 22.8 million (midyear 2020 estimate). According to the Ministry of Interior, more than 98 percent of the population is Muslim. Of the Muslim population, the great majority is Sunni and less than 7 percent is Shia. Roman Catholics, Protestants, and other religious groups account for less than 2 percent of the population. There are several thousand Baha’is, who reside primarily in Niamey and in communities on the west side of the Niger River. A small percentage of the population adheres primarily to indigenous religious beliefs. Some Muslims intermingle animist practices with their practice of Islam, although observers note this has become less common over the past decade.

International Religious Freedom Reports
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U.S. Department of State

The Lessons of 1989: Freedom and Our Future