The second largest religion in the world, Islam has a total of about 1.62 billion members, or 23 percent of the entire world's population.
About 49 countries have a Muslim majority, although Africa is the only continent with a Muslim majority.
Most of the world's Muslim population lives in South Asia, particularly the countries of Indonesia, Pakistan, and India.
According to Pew Research Center’s 2012 report, over 88 percent of Indonesia's population follows Islam, and 96.4 percent of the population of Pakistan is Muslim.
Countries nearing 100 percent Islamic populations include Morocco, Somalia, Afghanistan, Tunisia, Iran, and Western Sahara.
Source: Maps of World