The U.S. government estimates the total population at 123.2 million (July 2016 estimate). According to the 2010 census, approximately 83 percent identifies as Roman Catholic and 5 percent as evangelical Protestant. Religious groups that together constitute less than 5 percent of the population include Jews, Jehovah’s Witnesses, members of The Church of Jesus Christ of Latter-day Saints (Mormons), and Muslims. More than 2 percent of the population reports practicing a religion not otherwise specified, and nearly 5 percent report not practicing any religion. Some indigenous persons adhere to syncretic religions drawing from pre-Hispanic indigenous beliefs.

Official statistics sometimes differ from the membership figures provided by religious groups. Approximately 315,000 individuals identify themselves as Mormon in the 2010 census; Mormon officials, however, state their membership at approximately 1.3 million. There are large Protestant communities in the southern states of Chiapas and Tabasco. In Chiapas, evangelical Protestant leaders state nearly half of the state’s 2.4 million inhabitants are members of evangelical groups, but fewer than 5 percent of 2010 census respondents in Chiapas self-identified as evangelical.

According to the 2010 census, the Jewish community numbers approximately 67,500, some 42,000 of whom live in Mexico City and the state of Mexico. Jewish leaders said the total number of Jews in the country is approximately 45,000. Nearly half of the country’s approximately 4,000 Muslims are concentrated in Mexico City and the state of Mexico. An estimated half of the approximately 100,000 Mennonites are concentrated in the state of Chihuahua.