Razan County (Persian: شهرستان رزن) is in Hamadan province, Iran.

[5] At the time of the 2006 census, the county's population was 111,120 in 26,277 households.

[7] The 2016 census measured the population of the county as 107,587 in 32,207 households.

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

Media related to Razan County at Wikimedia Commons Iran portal