[3] After the 2006 National Census, Sareyn District was separated from the county in the establishment of Sareyn County.

[7] At the time of the 2006 census, the county's population was 542,930 in 131,950 households.

[8] The following census in 2011 counted 564,365 people in 156,242 households.

[9] The 2016 census measured the population of the county as 605,992 in 180,975 households.

[2] Ardabil County's population history and administrative structure over three consecutive censuses are shown in the following table Media related to Ardabil County at Wikimedia Commons