At the time of the 2006 National Census, Senjan's population was 10,592 in 2,897 households, when it was a city in the Central District. The following census in 2011 counted 12,249 people in 3,730 households.
In 2013, Senjan and the city of Karahrud were annexed by city of Arak.
↑Also romanized as Senjān; also known as Fenjān, Fījān, Senījān, and Zenjān
References
12سرشماري عمومي نفوس و مسكن 1390: استان مرکزی[General Population and Housing Census 2011: Markazi Province]. Iran Data Portal—Syracuse University (in Persian). مرکز آمار ایران [Statistical Centre of Iran]. Archived from the original(Excel) on 19 January 2023. Retrieved 11 July 2026.
↑Mousavi, Mir-Hossein (9 August 1987) [تاریخ تصویب (Approval date) 1366.5.18 (Iranian Jalali calendar)]. ایجاد و تشکیل 18 دهستان شامل روستاها، مزارع و مکانها در شهرستان اراک تابع استان مرکزی[Creation and formation of 18 rural districts including villages, farms and places in Arak County under Markazi province]. مرکز پژوهشهای مجلس شورای اسلامی ایران [Research Center of the Islamic Consultative Assembly of Iran] (in Persian). وزارت کشور [Ministry of the Interior]. هیات وزیران [Council of Ministers]. پیشنهاد شماره [Proposal No.] 46.1.5.53. Archived from the original on 15 December 2015. Retrieved 11 July 2026.
12Rahimi, Mohammad Reza (13 February 2013) [۲۵/۱۱/۱۳۹۱ تاریخ تصویب (Approval date 1391/11/25) (Iranian Jalali calendar)]. تصویب نامه در خصوص تقسیمات کشوری در استان مرکزی[Approval letter regarding national divisions in Markazi province]. مرکز پژوهشهای مجلس شورای اسلامی ایران [Research Center of the Islamic Consultative Assembly of Iran] (in Persian). وزارت کشور [Ministry of the Interior]. کمیسیون سیاسی دفاعی هیأت دولت [Political Defense Commission of the Government Board]. پیشنهاد شماره ۱۱۰۱۶/۴۲/۴/۱ [Proposal No. 11016/42/4/1]. Archived from the original on 8 December 2015. Retrieved 11 July 2026.
↑سرشماري عمومي نفوس و مسكن 1385: استان مرکزی[General Population and Housing Census 2006: Markazi Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 20 September 2011. Retrieved 11 July 2026.