Nahavand County (Persian: شهرستان نهاوند) is in Hamadan province, Iran.

[3] At the time of the 2006 National Census, the county's population was 178,683 in 46,283 households.

[5] The 2016 census measured the population of the county as 178,787 in 55,542 households.

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

Media related to Nahavand County at Wikimedia Commons