In more than 50 countries Islam is practiced, three of them are:
If the question asks about which country has the largest Muslim population (i.e. people that are practicing Islam), then it is Indonesia (~ 203 Million Muslims).
Middle East countries (Saudi Arabia, Iran, Iraq. Qatar, Kuwait, ...), India subcontinent (India, Pakistan, Bangladesh, Afghanistan, ...), South East Asia (Indonesia, Malaysia, the Philippines, ...), and North Africa
Around fifty countries have Islam religion as their major religion; including Indonesia, Pakistan, Bangladesh, Malaysia, Iran, Iraq, Saudi Arabia, Turkey, Syria, Kuwait, Qatar, Emirates, Yemen, Egypt, Algeria, Libya, Tunisia, Morocco, Sudan, Iran, Senegal, Chad, ....
As "Islam" is not a specific country, there is no active way to collectively gather information on the number of followers of the Islamic tradition. However, a rough estimate would place the current number of Muslims somewhere about 1.57 billion.
Middle East countries (Saudi Arabia, Iran, Iraq. Qatar, Kuwait, ...), India subcontinent (India, Pakistan, Bangladesh, Afghanistan, ...), and South East Asia (Indonesia, Malaysia, the Philippines, ...)
Islam is practiced all over the world.
In all the Caribbean countries but with different percentages in numbers.
Saudi Arabia, UAE, and Pakistan are some of the countries Muslims populate.
The major religion in Sahel countries is Islam. Islam is practiced by the majority of people in countries such as Mali, Niger, Chad, and Sudan, among others.
Christianity and Judaism is practiced mostly in the western world and Islam is mostly practiced in 3rd World Countries
There are 57 Muslim countries.Islam is practiced in almost all these countries. However, The Kingdom of Saudi Arabia, Gulf States, Pakistan, Afghanistan are a few where Islam is practice to a greater extent.
All over world countries and places
Islam is to be practiced. The Muslims practice Islam. They are found almost all over the world. There are 57 Independent Muslim countries where Islam is practiced. Some of these countries are: Saudi Arabia, Gulf states, Egypt, Syria, Libya, West, Jordon, Pakistan, Afghanistan, Indonesia, Bangla Desh
Most of the countries situated in Asia and Africa
Islam is a dominant religion mostly in Northern Africa and the Middle East as well as some central Asian countries.
In all southwest Asian countries and in particular in Pakistan, India, Bangladesh, and Middle East Countries.
Islam is being practiced in every country. The countries with the ten largest Muslim populations are Pakistan, India, Indonesia, Bangladesh, Turkey, Iran, Egypt, Nigeria, Algeria, and Morocco.