The name Sāvojbolāgh is derived from Turkish and means "cold springs".[4] The 14th-century author Hamdallah Mustawfi described it as having "a fine climate"; most of its water was drawn from qanats, and it produced a lot of fruit and grain.[5] He wrote that the district had previously been attached to Ray for fiscal purposes under the Seljuk Empire, but under Mongol rule it had been detached.[5] Its inhabitants, he wrote, were nomads who were "indifferent to religious matters".[5] The main villages were Sonqorabad, Najmabad, and Kharav.[5] The district's tax revenues he listed as 12,000 dinars.[5]
In 2007, two villages merged to form the new city of Seyfabad,[6] later renamed Golsar.[7] In 2010, the county was separated from Tehran province in the establishment of Alborz province.[3]
At the time of the 2006 census, the county's population (as a part of Tehran province) was 215,086 in 57,497 households.[10] The 2016 census measured the population of the county as 259,973 in 80,953 households.[2]
^ abLarijani, 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.
^ abcRahimi, Mohammad Reza (2010) [Approved 28 June 1389]. Approval letter regarding the rules of national divisions in Savojbolagh County. rc.majlis.ir (Report) (in Persian). Ministry of the Interior, Board of Ministers. Notification 154092/T44611H. Archived from the original on 12 November 2011. Retrieved 21 August 2024 – via The Research Center of the Islamic Council of Iran.
^Aref, 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.