At the time of the 2006 National Census, the village's population was 2,083 in 506 households, when it was in Asgariyeh Rural District of the former Pishva District in Varamin County. The following census in 2011 counted 2,122 people in 561 households, by which time the district had been separated from the county in the establishment of Pishva County. The rural district was transferred to the new Central District, and Qaleh Sin was transferred to Pishva Rural District created in the same district. The 2016 census measured the population of the village as 2,892 people in 811 households. It was the most populous village in its rural district.
12سرشماري عمومي نفوس و مسكن 1395: استان تهران[General Population and Housing Census 2016: Tehran Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 12 December 2021. Retrieved 25 June 2025.
↑سرشماري عمومي نفوس و مسكن 1385: استان تهران[General Population and Housing Census 2006: Tehran Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 20 September 2011. Retrieved 22 June 2025.
↑سرشماري عمومي نفوس و مسكن 1390: استان تهران[General Population and Housing Census 2011: Tehran Province]. Iran Data Portal—Syracuse University (in Persian). مرکز آمار ایران [Statistical Centre of Iran]. Archived from the original(Excel) on 20 January 2023. Retrieved 25 June 2025.