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At the time of the 2006 National Census, the district's population was 27,884 in 6,483 households. The following census in 2011 counted 28,062 people in 7,702 households. The 2016 census measured the population of the district as 25,862 inhabitants in 8,018 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.