Tehran - The Capital of Iran

Population
9,259,009
Language
Persian
Continent
Asia
Since
1786
Eco Ranking
114/195

Source: Environmental Performance Index 2024.

About Tehran

Tehran became the capital of Persia in 1786 when Agha Mohammad Khan, founder of the Qajar dynasty, chose it as his seat of power following his consolidation of control over Iran. The city's central location on the northern edge of the Iranian plateau, near the Alborz mountain range, influenced his choice. Under the Qajars and the subsequent Pahlavi dynasty, Tehran expanded into a major metropolis and modernised rapidly in the 20th century. The Iranian Revolution of 1979 transformed the city's political character fundamentally. The monarchy of Mohammad Reza Shah was overthrown, and Ayatollah Khomeini established an Islamic Republic governed by the principle of velayat-e faqih (guardianship of the jurist). Tehran became the seat of a hybrid system: an elected president and parliament coexist with unelected bodies including the Supreme Leader, the Guardian Council, and the Assembly of Experts. The Supreme Leader holds ultimate authority over the armed forces, judiciary, and state media. Tehran houses all major branches of this system. The city has also been the focal point of prolonged international tensions over Iran's nuclear programme, which has led to successive rounds of international sanctions and diplomatic negotiations, including the 2015 JCPOA nuclear agreement and its subsequent collapse. With a population of over 9 million, Tehran is one of the largest cities in the Middle East.

About Iran

Iran is an Islamic Republic governed under the principle of velayat-e faqih, in which supreme authority rests with the Supreme Leader, currently Ali Khamenei, who has held the position since 1989. The elected president and parliament operate within limits set by unelected clerical oversight bodies. Iran is not a member of the Arab League (it is Persian, not Arab) and has a distinct regional foreign policy supporting groups such as Hezbollah in Lebanon and various militias across the Middle East.

View Tehran on the map

View Tehran - The Capital of Iran on the map

Flight time from Tehran to other capitals

CityDistance (km)Flight Time
Abu Dhabi13001h 32m
Rome34004h 0m
Paris42004h 56m
London44005h 11m
Singapore66007h 46m
Tokyo77009h 4m
Cape Town850010h 0m
Washington, D.C.1020012h 0m
Canberra1280015h 4m
Buenos Aires1380016h 14m

Capitals with similar population to Tehran

CityPopulation
Seoul9,720,846
London9,648,110
Dhaka9,540,000
Tehran9,259,009
Mexico City9,209,944
Luanda8,330,047
Bangkok8,305,218

Capitals with similar eco ranking to Tehran

CityEco Rank
Honiara111
Ouagadougou111
Bissau112
Algiers114
Tehran114
Ciudad de la Paz115
Brazzaville116

Source: Environmental Performance Index 2024.

Frequently Asked Questions

  • Why is Tehran the capital of Iran?

    Tehran became the capital in 1786 when Agha Mohammad Khan, founder of the Qajar dynasty, established his court there. He chose it for its central location and strategic position near the Alborz mountains. It replaced Isfahan as the most important political centre and has remained the capital through the Qajar dynasty, the Pahlavi monarchy, and the Islamic Republic.

  • What happened in the 1979 Iranian Revolution?

    The 1979 revolution overthrew Shah Mohammad Reza Pahlavi and established an Islamic Republic under Ayatollah Ruhollah Khomeini. The revolution was driven by a coalition of Islamist, nationalist, and leftist forces. After the Shah's departure in January 1979, Khomeini returned from exile in February, and a new constitution establishing the principle of clerical governance was approved by referendum.

  • Who holds power in Tehran's government?

    Iran's political system is dual: elected institutions (the president and the Majlis, or parliament) coexist with unelected clerical bodies. The Supreme Leader holds ultimate authority over the armed forces, foreign policy, judiciary, and state media. The Guardian Council vets candidates for all elections, disqualifying many. The Supreme Leader can override decisions of the elected president and parliament.

  • What is Iran's nuclear programme and why has it caused international tensions?

    Iran has pursued uranium enrichment and nuclear development since the 1950s, under both the Shah and the Islamic Republic. Western governments and Israel have long suspected Iran of seeking nuclear weapons capability, which Tehran denies. The programme has led to UN and unilateral sanctions. A multilateral nuclear deal (JCPOA) was reached in 2015 but collapsed after the U.S. withdrew in 2018 under President Trump.

  • Is Tehran the largest city in Iran?

    Yes. Tehran is by far the largest city in Iran, with a population of approximately 9.3 million in the city proper and over 15 million in the greater metropolitan area. It accounts for a disproportionate share of Iran's economic output, government employment, and population. Iran's second-largest city, Mashhad, has a population of around 3.4 million.

Sights and landmarks

Tehran has more museum riches than its relatively young status as a capital might suggest. The National Museum of Iran houses one of the finest collections of Persian archaeology in the world, from prehistory to the Islamic period. The Golestan Palace complex, a UNESCO World Heritage Site, is the historic seat of the Qajar kings and displays a unique fusion of Persian and European architecture. The National Jewels Museum in the Central Bank holds the crown jewels of the former Persian shahs, including the Darya-ye Noor diamond, one of the largest pink diamonds in the world. The Museum of Contemporary Art possesses one of the most valuable collections of Western modern art outside Europe and America, assembled before the 1979 revolution.

Climate and best time to visit

Tehran has a cold semi-arid mountain climate with considerable elevation differences within the city itself: the north at more than 1,800 metres is considerably cooler than the south at around 1,000 metres. Winters bring snow in the north of the city, with ski resorts less than an hour away at Tochal and Dizin. Summers are hot and dry in the lower-lying south, but more pleasant in the north. Spring and autumn offer the most pleasant weather conditions for visitors. Air pollution is a serious problem: Tehran is surrounded by mountains that hinder the dispersal of exhaust fumes, causing the city to be regularly rated as one of the most polluted capitals in the world.

Economy

Tehran generates a disproportionately large share of Iran's gross domestic product: estimates range from 25 to 30% for the city alone. The economy is dominated by the petrochemical industry, steel manufacturing, the automotive sector and financial services. Decades of international sanctions, imposed over the nuclear programme, have structurally damaged the economy, severely weakened the currency and almost entirely excluded foreign investment. The bazaar system of Tehran, with the Grand Bazaar as its epicentre, forms an informal but economically powerful trade network that partly operates outside the formal banking system. Technology companies and start-ups are active despite the sanctions, focused on the domestic market.
Tehran, capital of Iran
Tehran, capital of Iran

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