As of 2023, the estimated population of Iran is around 89.2 million people. Iran is the 17th-most populous country in the world and the second largest nation in the Middle East. The country has one of the highest urban growth rates in the world, with most internal migrants settling around the cities of Tehran, Isfahan, Ahvaz, and Qom. Tehran is the capital and largest city of Iran, with a population of around 8.8 million people.