At the time of the 2006 National Census, the village's population was 220 in 50 households, when it was in Hezarmasjed Rural District of the Central District. The following census in 2011 counted 182 people in 48 households. The 2016 census measured the population of the village as 252 people in 83 households.
In 2021, the rural district was separated from the district in the formation of Hezarmasjed District, and Sang Divar was transferred to Layen Rural District created in the new district.
12سرشماري عمومي نفوس و مسكن 1395: استان خراسان رضوی[General Population and Housing Census 2016: Razavi Khorasan Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 2 April 2022. Retrieved 19 December 2022.
12Jahangiri, Eshaq (5 May 2021) [مصوب (Approved) 1400,02,15) (Iranian Jalali calendar)]. تصويب نامه در خصوص تقسيمات كشوري در شهرستان كلات استان خراسان رضوي[Letter of approval regarding national divisions in Kalat County, Razavi Khorasan province]. سامانه ملی قوانین و مقررات [National System of Laws and Regulations] (in Persian). وزارت کشور [Ministry of the Interior]. هیات وزیران [Council of Ministers]. پيشنهاد شماره [Proposal Number] 59437. Archived from the original on 30 April 2023. Retrieved 3 March 2026.
↑سرشماري عمومي نفوس و مسكن 1385: استان خراسان رضوی[General Population and Housing Census 2006: Razavi Khorasan Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 20 September 2011. Retrieved 25 September 2022.
↑سرشماري عمومي نفوس و مسكن 1390: استان خراسان رضوی[General Population and Housing Census 2011: Razavi Khorasan 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 19 December 2022.