What Is The Population Of Iran 2024 By Religion. The vast majority of iranians are muslims of the ithnā ʿasharī, or twelver, shiʿi branch, which is the official state religion. The most popular religion is christianity, followed by an estimated 2.38 billion people.

The population of iran is equivalent to 1.12% of the world’s total’s. Population is concentrated in the north, northwest, and west, reflecting the position of the zagros and elburz mountains;