Region 1
Capital: Tehran
Population: 23,343,033
Area: 193,109
Provinces: Alborz Province, Golestan Province, Mazandaran Province, Qazvin Province, Qom Province, Semnan Province, Tehran Province
Region 2
Capital: Isfahan
Population: 12,973,089
Area: 354,885
Provinces: Bushehr Province, Chaharmahal and Bakhtiari Province, Fars Province, Hormozgan Province, Isfahan Province, Kohgiluyeh and Boyer-Ahmad Province
Region 3
Capital: Tabriz
Population: 12,782,820
Area: 165,839
Provinces: Ardabil Province, East Azerbaijan Province, Gilan Province, Kordestan Province, West Azerbaijan Province, Zanjan Province
Region 4
Capital: Kermanshah
Population: 11,739,552
Area: 185,978
Provinces: Hamadan Province, Ilam Province, Kermanshah Province, Khuzestan Province, Lorestan Province, Markazi Province
Region 5
Capital: Mashhad
Population: 13,145,227
Area: 734,576
Provinces: Kerman Province, North Khorasan Province, Razavi Khorasan Province, Sistan and Baluchestan Province, South Khorasan Province, Yazd Province