At the time of the 2006 National Census, Si Joval's population was 3,026 in 631 households, when it was a village in Jafarbay-ye Jonubi Rural District of the Central District.[5] The following census in 2011 counted 3,479 people in 856 households,[6] by which time villages had been separated from the rural district in the establishment of Si Joval District. Si Joval was transferred to Qarah Su-ye Gharbi Rural District created in the district.[4] The 2016 census measured the population of the village as 3,747 people in 976 households. It was the most populous village in its rural district.[2]
After the census, Si Joval was elevated to the status of a city.[7]
^Si Joval can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3085793" in the "Unique Feature Id" form, and clicking on "Search Database".