At the time of the 2006 National Census, the village's population was 774 in 169 households, when it was in Chahardangeh Rural District[b] of the former Hurand District of Ahar County.[5] The following census in 2011 counted 693 people in 180 households.[6] The 2016 census measured the population of the village as 687 people in 200 households. It was the most populous village in its rural district.[2]
After the census, the district was separated from the county in the establishment of Hurand County. The rural district was transferred to the new Chahardangeh District and renamed Chahardangeh-ye Shomali Rural District. Arnan was transferred to Chahardangeh-ye Jonubi Rural District created in the district.[4]
^Arnan can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3776657" in the "Unique Feature Id" form, and clicking on "Search Database".