At the time of the 2006 National Census, Nalas's population was 5,891 in 1,088 households, when it was a village in Melkari Rural District of Vazineh District. The following census in 2011 counted 6,985 people in 1,740 households. The 2016 census measured the population of the village as 8,503 people in 2,125 households. It was the most populous village in its rural district.
The village of Nalas was converted to a city in 2018, and in 2022 it was transferred to Rabat District.
12Jahangiri, Eshaq (18 November 2018) [27/08/1397 (1397/08/27) (Iranian Jalali calendar)]. تصویبنامه در خصوص تبدیل روستای نلاس شهرستان سردشت در استان آذربایجان غربی به شهر[Resolution on the conversion of Nalas village, Sardasht County, West Azerbaijan province, into a city]. پژوهشکده حقوقی شهر دانش [Shahr Danesh Law Research Institute] (in Persian). وزارت کشور [Ministry of the Interior]. هیات وزیران [Council of Ministers]. شماره ۱۰۷۸۱۴/ت۵۵۰۴۶هـ [No. 107814/T55046H]. Archived from the original on 22 March 2023. Retrieved 14 October 2025.
12سرشماري عمومي نفوس و مسكن 1395: استان آذربایجان غربی[General Population and Housing Census 2016: West Azerbaijan Province]. مرکز آمار ایران [Statistical Centre of Iran] (in Persian). Archived from the original(Excel) on 30 August 2022. Retrieved 19 December 2022.
1234Mokhber, Mohammad (15 August 2022) [مصوب 1401,05,24 (Approved 1401/5/24) (Iranian Jalali calendar)]. منتزع شدن شهر نلاس از بخش وزينه و الحاق به شهرستان سردشت در استان آذربايجان غربي[The separation of the city of Nalas from Vazineh District and its annexation to Sardasht County in West Azerbaijan 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] 101108. Archived from the original on 28 September 2023. Retrieved 12 October 2025.
↑سرشماري عمومي نفوس و مسكن 1385: استان آذربایجان غربی[General Population and Housing Census 2006: West Azerbaijan 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 آذربایجان غربی[General Population and Housing Census 2011: West Azerbaijan 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.