Markazi Province is one of the 31 provinces of Iran. The word markazi means central in Persian. In 2014 it was placed in Region 4. Markazi lies in western Iran. Its capital is Arak. Its population is estimated at 1.41 million. The present borders of the province date to the 1977, when the province was split into the current Markazi and the Tehran Province, with portions being annexed by Esfahan, Semnan Province, and Zanjan.
The major cities of the province are: Saveh, Arak, Mahallat, Zarandiyeh, Khomein, Delijan, Tafresh, Ashtian, Shazand (previously known as Sarband) and Farahan.
Markazi province was part of the Median Empire in the first millennium BC, which included all of the central and western parts of modern-day Iran. The region is considered to be one of the ancient settlements on the Iranian plateau. Numerous remaining ruins testify to the antiquity of this area.
In the early centuries Islam, the name of the area was changed to Jibal or Qahestan. By the early 10th century, Khorheh had become a famous city of Jibal province, followed by Tafresh and Khomein.