At the time of the 2006 National Census, the city's population was 5,577 in 1,448 households,[7] when it was in Savojbolagh County of Tehran province. The 2016 census measured the population of the city as 48,828 inhabitants in 14,380 households,[2] by which time the county had been separated from the province in the establishment of Alborz province.[8]
In 2020, the district was separated from the county in establishing Chaharbagh County and renamed the Central District. Chaharbagh became the new county's capital.[5]
^ abAref, Mohammad Reza (2005) [Approved 29 January 1384]. Divisional reforms in Savojbolagh County in Tehran province. lamtakam.com (Report) (in Persian). Ministry of the Interior, Political-Defense Commission of the Government Board. Notification 30868/K5937T. Archived from the original on 18 March 2024. Retrieved 21 August 2024 – via Lam ta Kam.
^Chaharbagh can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3765994" in the "Unique Feature Id" form, and clicking on "Search Database".
^Larijani, Ali (2010) [Approved 16 April 1389]. Alborz province establishment law. lamtakam.com (Report) (in Persian). Guardian Council. Notification 412/30588. Archived from the original on 16 December 2023. Retrieved 21 August 2024 – via Lam ta Kam.