At the time of the 2006 National Census, the village's population was 1,047 in 278 households.[4] The following census in 2011 counted 799 people in 259 households.[5] The 2016 census measured the population of the village as 820 people in 286 households. It was the most populous village in its rural district.[2]
^OpenStreetMap contributors (20 August 2024). "Kazaj, Khalkhal County" (Map). openstreetmap.org (OpenStreetMap) (in Persian). Retrieved 20 August 2024.
^Kazaj can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3070105" in the "Unique Feature Id" form, and clicking on "Search Database".