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At the time of the 2006 National Census, the district's population was 23,015 in 4,852 households. The following census in 2011 counted 25,028 people in 6,598 households. The 2016 census measured the population of the district as 20,927 inhabitants in 6,031 households.
Habibi, Hassan (c. 2023) . Approval letter regarding the creation and establishment of Shirin Su District. qavanin.ir (Report) (in Persian). Ministry of the Interior, Political-Defense Commission of the Government Council. Resolution 93808/T907. Archived from the original on 20 March 2023. Retrieved 22 October 2023 – via Laws and Regulations Portal of the Islamic Republic of Iran.