Province Capital Area[4] Population[5] Density Shahrestans (counties) Life expectancy, male[6] Life expectancy, female[6] Notes Map Alborz Karaj 5,833 km2 (2,252 sq mi) 2,712,400 413.6/km2 (1,071/sq mi) 4 74.4 78 Until 23 June 2010, Alborz was part of Tehran province.