At the time of the 2006 National Census, the city's population was 5,577 in 1,345 households. The following census in 2011 counted 6,666 people in 1,725 households. The 2016 census measured the population of the city as 7,037 people in 2,038 households.
12Habibi, Hassan (20 May 1998) [تاریخ تصویب (Approval date) 1377/02/30 (Iranian Jalali calendar)]. تبدیل روستای سجاس مرکز سجاس رود تابع شهرستان خدابنده در استان زنجان به شهر سجاس[The transformation of Sojas village, the center of Sojas Rud District under Khodabandeh County in Zanjan province, into Sojas city]. لام تا کام [Lam ta Kam] (in Persian). وزارت کشور [Ministry of the Interior]. هیات وزیران [Council of Ministers]. شناسه [ID] 543A2504-D7F1-4DF5-9F7E-9860C5D8D176. شماره دوره [Course number] 77. Archived from the original on 18 December 2023. Retrieved 25 June 2025.
123سرشماري عمومي نفوس و مسكن 1395: استان زنجان[General Population and Housing Census 2016: Zanjan Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 27 April 2022. Retrieved 19 December 2022.
↑Habibi, Hassan (19 February 1995) [تاریخ تصویب (Approval date) 1373/11/30 (Iranian Jalali calendar)]. ایجاد و اصلاحات در محدوده استان زنجان[Establishment and reforms within the province of Zanjan]. لام تا کام [Lam ta Kam] (in Persian). وزارت کشور [Ministry of the Interior]. کمیسیون سیاسی دفاعی هیأت دولت [Political Defense Commission of the Government Board]. شناسه [ID] D07D9EBB-7EF5-4B68-9A5E-0CD1217E5519. شماره دوره [Course number] 73, شماره جلد [Volume number] 254. Archived from the original on 17 December 2023. Retrieved 25 June 2025.
↑Mousavi, Mir-Hossein (9 November 1986) [تاریخ تصویب (Approval date) 1365/08/18 (Iranian Jalali calendar)]. ایجاد و تشکیل تعداد 9 دهستان شامل روستاها و مزارع و مکانها در شهرستان خدابنده تابع استان زنجان[Creation and formation of nine rural districts, including villages, farms and places in Khodabandeh County under Zanjan province]. لام تا کام [Lam ta Kam] (in Persian). وزارت کشور [Ministry of the Interior]. هیات وزیران [Council of Ministers]. شناسه [ID] 66E9DE86-7D23-4721-A9AF-C99963BDD1D6. شماره دوره [Course number] 65, شماره جلد [Volume number] 5. Archived from the original on 18 December 2023. Retrieved 25 June 2025.
↑سرشماري عمومي نفوس و مسكن 1385: استان زنجان[General Population and Housing Census 2006: Zanjan 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 زنجان[General Population and Housing Census 2011: Zanjan Province]. Iran Data Portal—Syracuse University (in Persian). مرکز آمار ایران [Statistical Centre of Iran]. Archived from the original(Excel) on 21 January 2023. Retrieved 19 December 2022.