Iran is subdivided into thirty one provinces (Persian: استان Ostān, plural استان‌ها Ostānhā), each governed from a local center, usually the largest local city, which is called the capital (Persian: Markaz) of that province. The provincial authority is headed by a Governor-General (Persian: Ostāndār), who is appointed by the Minister of the Interior subject to approval of the cabinet.

According to Encyclopædia Britannica, in 1908 there were thirty five administrative divisions in Persia, as follows:

Until 1950, Iran was divided into twelve provinces: Ardalan, Azerbaijan, Baluchestan, Fars, Gilan, Araq-e Ajam, Khorasan, Khuzestan, Kerman, Larestan, Lorestan, and Mazandaran.

In 1950, Iran was reorganized to form ten numbered provinces with subordinate governorates: Gilan; Mazandaran; East Azerbaijan; West Azerbaijan; Kermanshah; Khuzestan; Fars; Kerman; Khorasan; Isfahan.

From 1960 to 1981 the governorates were raised to provincial status one by one. Since then several new provinces have been created, most recently in 2004 when the province of Khorasan was split into three new provinces as well as splitting of the new Alborz province from Teheran province in 2010.

Coordinates: 32°N 53°E / 32°N 53°E / 32; 53

Iran (ⁱ/ɪˈrɑːn/ or /aɪˈræn/;Persian: ایران‎ [ʔiˈɾɒn] ( listen)), officially the Islamic Republic of Iran (Persian: جمهوری اسلامی ایران‎ Jomhuri-ye Eslāmi-ye Irān), is a country in Southern and Western Asia. The name "Iran", which in Persian means "Land of the Aryans", has been in use natively since the Sassanian era. It came into use internationally in 1935, before which the country was known to the Western world as Persia ( /ˈpɜrʒə/ or /ˈpɜrʃə/). Both "Persia" and "Iran" are used interchangeably in cultural contexts; however, "Iran" is the name used officially in political contexts.

The 18th-largest country in the world in terms of area at 1,648,195 km² (636,372 sq mi), Iran has a population of around 79 million. It is a country of particular geopolitical significance owing to its location in the Middle East and central Eurasia. Iran is bordered on the north by Armenia, Azerbaijan and Turkmenistan. As Iran is a littoral state of the Caspian Sea, which is an inland sea, Kazakhstan and Russia are also Iran's direct neighbors to the north. Iran is bordered on the east by Afghanistan and Pakistan, on the south by the Persian Gulf and the Gulf of Oman, on the west by Iraq and on the northwest by Turkey. Tehran is the capital, the country's largest city and the political, cultural, commercial and industrial center of the nation. Iran is a regional power, and holds an important position in international energy security and world economy as a result of its large reserves of petroleum and natural gas. Iran has the second largest proven natural gas reserves in the world and the fourth largest proven petroleum reserves.