Khorramdarreh County (Persian: شهرستان خرمدره) is in Zanjan province, Iran.

[3] At the time of the 2006 National Census, the county's population was 60,027 in 15,317 households.

[5] The 2016 census measured the population of the county as 86,123 in 27,215 households.

[2] Khorramdarreh County's population history and administrative structure over three consecutive censuses are shown in the following table.

Media related to Khorramdarreh County at Wikimedia Commons