At the time of the 2006 National Census, the city's population was 3,886 in 946 households. The following census in 2011 counted 4,393 people in 1,184 households. The 2016 census measured the population of the city as 4,762 people in 1,332 households.
123Aref, Mohammad Reza (4 July 2004) [تاریخ تصویب (Approval date) 1383.4.14 (Iranian Jalali calendar)]. تبدیل شدن روستاهای یونسی ، اسلام آباد، اسفدن ، سده ، زهان در استان خراسان رضوی به شهرهای یونسی ، نیمبلوک ، اسفدن ، آرین شهر[The transformation of the villages of Yunesi, Eslamabad, Esfeden, Sedeh, and Zohan in Khorasan Razavi province into the cities of Yunesi, Nimbeluk, Esfeden, and Arianshahr]. 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 [Proposal No.] 1.4.42.52102. Archived from the original on 20 October 2020. Retrieved 25 April 2026.
12سرشماري عمومي نفوس و مسكن 1395: استان خراسان جنوبی[General Population and Housing Census 2016: South Khorasan Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 17 October 2020. Retrieved 19 December 2022.
↑سرشماري عمومي نفوس و مسكن 1385: استان خراسان جنوبی[General Population and Housing Census 2006: South 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 جنوبی[General Population and Housing Census 2011: South Khorasan Province]. Iran Data Portal—Syracuse University (in Persian). Archived from the original(Excel) on 20 January 2023. Retrieved 19 December 2022.