For the administrative division, see Sain Qaleh Rural District. For the city in West Azerbaijan province formerly known as Sain Qaleh, see Shahin Dezh.
At the time of the 2006 National Census, the city's population was 11,083 in 2,896 households.[6] The following census in 2011 counted 11,939 people in 3,470 households.[7] The 2016 census measured the population of the city as 12,989 people in 4,048 households.[2]
The 14th-century author Hamdallah Mustawfi mentioned Sa'in Qal'eh in his Nuzhat al-Qulub: he referred to "the village called Quhūd, which the Mongols call Sāin Qal'ah, and which is the chief of all those neighboring hamlets".[8] He also wrote that it was close to the castle of Sarjahan.[8]
^Sain Qaleh can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3081938" in the "Unique Feature Id" form, and clicking on "Search Database".
^Habibi, Hassan (18 May 1390) [Approved 8 May 1376]. Changes in national divisions in Gilan and Mazandaran provinces. rc.majlis.ir (Report) (in Persian). Ministry of the Interior, Board of Ministers. Proposal 1.4.42.5543. Archived from the original on 9 August 2011. Retrieved 17 December 2023 – via Islamic Parliament Research Center.