In its first estimate, Pew found 2.35 million Muslims living in the United States in 2007. That figure rose to 2.75 million in 2011. In 2017, approximately 3.45 million Muslims of all ages were living in the United States, roughly 1.1% of the total U.S. population. The largest concentrations of Muslims are in California, Florida, Michigan, New York and New Jersey.
Pew says the Muslim population has grown at a rate of roughly 100,000 per year since 2011. This is not attributable to conversion; roughly the same number of Americans convert to Islam as leave the faith. The increase is primarily due to immigration and a high fertility rate.
By comparison, there are nearly 7 million Jews (2.1% of the population) in the United States. Pew projects, however, that the Muslim population is growing faster and that by 2040, Muslims will replace Jews as the nation’s second-largest religious group after Christians. By 2050, the U.S. Muslim population is projected to reach 8.1 million, or 2.1% of the nation’s total population — nearly twice the share of today.
Source: Besheer Mohamed, “New estimates show U.S. Muslim population continues to grow,” Pew Research Center, (January 3, 2018).