Top 10 largest OIC capitals by population in 2025
The Organisation of Islamic Cooperation’s 57 member states are home to some of the world’s fastest-growing urban centers, and their capitals capture much of the demographic weight of the Muslim world.
From South Asian megacities absorbing millions of rural migrants to Gulf capitals transformed by labour migration and petrostate investment, these cities illustrate how population and power are increasingly concentrated in large urban agglomerations. Taken together, the ten largest OIC capitals account for well over 100 million people in their contiguous built‑up areas.
1. Jakarta, Indonesia — 41.9 million
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Muhammad Ali Bandial