[4] At the time of the 2006 census, the county's population was 626,183 in 165,753 households.

[5] The following census in 2011 counted 651,821 people in 190,808 households.

[6] The 2016 census measured the population of the county as 676,105 in 210,775 households.

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

Media related to Hamadan County at Wikimedia Commons