[3][4] Its capital is the city of Karaj,[3] which lies 10 km west of Tehran, at the foothills of the Alborz mountains.

[3] The majority of the population of Alborz identify as ethnic Persians.

[citation needed] At the time of the 2006 National Census, the counties that were later to form the province had a total population of 2,053,233.

[5] The first census after the creation of Alborz province counted 2,412,513 people in 2011.

The population history and structural changes of Alborz province's administrative divisions over two censuses are shown in the following table.