Gorgan was called Esteraba or Astarabad until 1937.[2] Hamadan Hamadan 19,368 km2 (7,478 sq mi) 1,738,234 90.8/km2 (235/sq mi) 8 71.2 75.6 Originally part of Kermanshah province.[2] Hormozgān Bandar Abbas 70,669 km2 (27,285 sq mi) 1,776,415 22.3/km2 (58/sq mi) 11 69.9 73.7 Originally part of Kerman province.[2] Until 1977, the province was known as Banader va Jazayer-e Bahr-e Oman (Ports and Islands of the Sea of Oman).[2] Ilam Ilam 20,133 km2 (7,773 sq mi) 580,158 27.7/km2 (72/sq mi) 7 70.5 72 Originally part of Kermanshah province.[2] Isfahan Isfahan 107,029 km2 (41,324 sq mi) 5,120,850 45.6/km2 (118/sq mi) 21 73 77 In 1986, some parts of Markazi province were transferred to Isfahan, Semnan, and Zanjan provinces.[2] Kerman Kerman 183,285 km2 (70,767 sq mi) 3,164,718 16.3/km2 (42/sq mi) 14 71.4 75.5 Kermanshah Kermanshah 24,998 km2 (9,652 sq mi) 1,952,434 77.8/km2 (202/sq mi) 13 70.4 75.3 Between 1950 and 1979, both Kermanshah province and city were known as Kermanshahan and between 1979 and 1995 were known as Bakhtaran.[2] Khorasan, North Bojnourd 28,434 km2 (10,978 sq mi) 863,092 30.5/km2 (79/sq mi) 6 69.8 72.6 On 29 September 2004, Khorasan was divided into three provinces.