^
abThe area and population of
Holeylan and
Chardavol counties are estimated because Holeylan county was established on 4 January 2020 and prior to that it was a district of
Chardavol County and the latest official numbers belong to Iran's 2016 Census.
References
Alsadat Haeri, Zohreh (2019).
سالنامه آماري استان ايلام ۱۳۹۷ [Statistical Yearbook of Ilam Province, 1397]. Ilam, Iran: سازمان مدیریت و برنامهریزی استان ایلام.