At the time of the 2006 National Census, the city's population was 22,589 in 5,558 households, when it was capital of the former Chaypareh District in Khoy County. The following census in 2011 counted 23,769 people in 6,482 households, by which time the district had been separated from the county in the establishment of Chaypareh County. Qarah Zia ol Din was transferred to the new Central District as the county's capital. The 2016 census measured the population of the city as 26,767 people in 7,819 households.
^Also known as Qarah Zia od Din, Qarah Ẕīā' od Dīn, Qareh Zeyā ed Dīn, Qareh Ẕīā' od Dīn, and Qareh Zīyā ’Eddīn; also known as Ghareh Ziya’ Oddin, Qaraziadin and Qara Zīa ud Dīn
^Qarah Zia ol Din can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3079800" in the "Unique Feature Id" form, and clicking on "Search Database".
^ Davodi, Parviz (24 January 1393) [Approved 18 September 1386]. Approval letter regarding reforms of national divisions in West Azerbaijan province. rc.majlis.ir (Report) (in Persian). Ministry of the Interior, Political-Defense Commission of the Government Board. Proposal 138613/42/4/1; Notification 156165/T32690K. Archived from the original on 13 April 2014. Retrieved 21 November 2023 – via Islamic Parliament Research Center.
