Most people guess Saudi Arabia. Some say Egypt. A few say Pakistan. Almost nobody guesses Indonesia on the first try, and that’s exactly the problem. The country with the single largest Muslim population on earth is a Southeast Asian archipelago that most people associate with beaches and tourism, not with being home to 13% of the world’s entire Muslim population.
Let’s get into the full picture, because it’s a lot more interesting than a simple ranking.
Indonesia: The Answer Nobody Expects
Indonesia is home to approximately 242 to 246 million Muslims, which is more than any other country on the planet. According to World Population Review, that number alone is staggering. It’s more Muslims than the entire population of Brazil. More than the United States and Canada combined. And yet Indonesia doesn’t come up in most conversations about Islam because it’s not in the Middle East and it doesn’t dominate international news the way Arab countries do.
About 87% of Indonesia’s population follows Islam, and Islam arrived there not through conquest but largely through trade routes and Sufi missionaries from the 13th century onward. That’s a detail worth sitting with. A religion that spread through commerce and conversation, not armies, ended up producing the world’s largest Muslim-majority nation. You can read the full historical breakdown on Islam by country Wikipedia.
Top Muslim Populations by Country
Here’s where the numbers stand as of 2025 and 2026. The rankings are closer than most people think.
Source: IslamiCity Muslim Population 2025 and Times Prayer Global Data
What that table tells you is that the overwhelming majority of the world’s Muslims, well over 60%, live in South and Southeast Asia, not the Middle East. That’s a geographical reality that completely contradicts the mental map most people carry about where Islam actually lives.
Why Indonesia and Not Saudi Arabia
Saudi Arabia has about 31 to 32 million Muslims. That’s it. That’s less than the Muslim population of a single Indian state. The reason Saudi Arabia feels central to Islam isn’t population, it’s religious and historical significance. Mecca and Medina are both in Saudi Arabia, which makes it spiritually important to every Muslim in the world. But spiritually central and numerically dominant are two very different things.
I’d argue this is one of the most persistent misconceptions in how people understand the Muslim world. The heartland of Islamic civilization historically was the Middle East. The numerical reality today is firmly in Asia.
India’s Unique Position
India deserves a separate mention because the situation there is genuinely unusual. India is a Hindu-majority country, with Muslims making up only about 15% of the population. And yet that 15% translates to somewhere between 200 and 225 million people, which makes India the third largest Muslim population on earth.
Think about that for a second. A religious minority in one country still outnumbers the total Muslim populations of most Muslim-majority nations. That’s a direct consequence of India’s sheer size. It’s a minority that’s larger than most majorities. The IslamiCity country breakdown puts this contrast in sharp relief when you compare the raw numbers side by side.
Which Country Has 100% Muslims
The Maldives is the only country in the world where the constitution formally defines citizenship through Islam, effectively making the entire citizen population Muslim. Non-Muslims cannot become citizens of the Maldives, that’s written directly into their law. A full explainer on this is covered in the Maldives 100% Muslim country video that breaks down exactly how the law works in practice.
Several other countries come extremely close. Morocco is reported at 100% Muslim in practice, Somalia and Afghanistan sit at 99.7%, Iran at 99.5%, Tunisia at 99.5%, Iraq and Yemen both at around 99.1%, and Mauritania at 99.1% as well.
Which Country Has the Fastest Growing Muslim Population
This is where the future gets interesting. Islam is currently the fastest-growing religion in the world, full stop. According to a Pew Research study covered by NPR, between 2010 and 2020 the global Muslim population grew by approximately 347 million people, which is more growth than all other religions combined in that same decade.
In terms of countries, sub-Saharan Africa is where Muslim population growth is fastest right now. Nigeria, Niger, Tanzania, Mali, and Burkina Faso are all experiencing rapid growth driven by high birth rates and a very young demographic base. Nigeria in particular is on a trajectory that could push it past Bangladesh and potentially India in total Muslim population over the coming decades. The Muslim population growth Wikipedia article has detailed projection charts if you want to see the trend lines visually.
India is also worth watching closely. Islam is the fastest-growing religion in India in absolute numbers, with Muslim population growth consistently outpacing other religious groups across every census period since independence. A detailed analysis from OpIndia’s Pew coverage breaks down those regional growth patterns in detail.
Globally, projections suggest Islam could become the world’s largest religion by around 2070 if current trends continue, overtaking Christianity. That’s not a political statement, it’s a demographic one rooted in birth rate data and the age structure of Muslim populations worldwide.
Muslims Living as Minorities
Here’s something most articles skip over entirely. There are massive Muslim populations living as minorities in countries that aren’t Muslim-majority at all.
Russia has approximately 16 to 20 million Muslims, mostly concentrated in Tatarstan, Chechnya, and the North Caucasus. China has around 25 million Muslims, primarily from the Uyghur and Hui ethnic groups. France and Germany each have around 6 million Muslims. The United States has about 4 million, the United Kingdom around 4.5 million. The full minority population data is compiled in detail at World Population Review’s Muslim data.
These communities often get left out of the global Muslim conversation entirely, but they’re real, significant, and their experience of practicing Islam looks completely different from what you’d find in Indonesia or Pakistan.
The Global Total
As of 2025, there are approximately 2 billion Muslims in the world, making up about 24% of the global population, roughly one in every four people on earth.
The religion spans every continent, dozens of languages, centuries of distinct cultural development, and an enormous range of lived experiences that don’t reduce neatly to any single image. The fact that the world’s largest Muslim population lives in a democratic island nation in Southeast Asia, speaks hundreds of local languages, and has never been an Arab country is probably the single best argument against the idea that Islam looks the same everywhere. It doesn’t. And knowing where Muslims actually live is the honest starting point for understanding anything else about the religion.
