At the time of the 2006 National Census, the village's population was 779 in 179 households, when it was in the former Falard District of Lordegan County.[5] The following census in 2011 counted 1,277 people in 305 households.[6] The 2016 census measured the population of the village as 1,131 people in 307 households. It was the most populous village in its rural district.[2]
In 2022, the district was separated from the county in the establishment of Falard County, and the rural district was transferred to the new Emamzadeh Hasan District.[4]
^OpenStreetMap contributors (29 August 2024). "Shah Najaf, Falard County" (Map). openstreetmap.org (OpenStreetMap) (in Persian). Retrieved 29 August 2024.
^Shah Najaf can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3083974" in the "Unique Feature Id" form, and clicking on "Search Database".