Tehran is a melting pot of Iran's diverse ethnic and linguistic groups, drawing migrants from every province for economic and educational opportunities.
| Demographic Metric | Details | | :--- | :--- | | **City Population** | ~8.7 million (City), ~15 million (Metropolitan Area) | | **Primary Language** | Persian (Farsi) | | **Ethnic Diversity** | Persian (majority), significant populations of Azeris, Gilakis, Mazandaranis, and Kurds. | | **Religion** | Shia Islam (vast majority); minorities of Sunni Islam, Christianity (Armenian/Assyrian), Judaism, and Zoroastrianism. | | **Age Distribution** | Heavily skewed towards young adults; a legacy of Iran's 1980s baby boom, though birth rates are now declining. |