At the time of the 2006 National Census, the village's population was 176 in 34 households, when it was in the former Sarchehan District of Bavanat County.[5] The following census in 2011 counted 164 people in 39 households.[6] The 2016 census measured the population of the village as 174 people in 51 households.[2]
After the census, the district was separated from the county in the establishment of Sarchehan County. The rural district was transferred to the new Central District.[7]
^Siyahun can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "11194771" in the "Unique Feature Id" form, and clicking on "Search Database".