As of 2010, there were 1.6 billion Muslims around the world, representing 23% of all people worldwide. This makes Islam the world's second-largest religion.

There are two major branches of Islam – Sunni and Shia. The overwhelming majority (87-90%) of Muslims are Sunnis; about 10-13% are Shia Muslims.

Muslims are concentrated in the Asia-Pacific region, where six-in-ten (62%) of all Muslims reside. Many Muslims also live in the Middle East and North Africa (20%) and sub-Saharan Africa (16%). The remainder of the world's Muslim population is in Europe (3%), North America (less than 1%) and Latin America and the Caribbean (also less than 1%).

Muslims make up a majority of the population in 49 of the 232 countries and territories included in the Global Religious Futures project. Nearly three-quarters of all Muslims (73%) live in these countries.

Explore population characteristics and survey results for Muslims using Topics & Questions or the Data Explorer.