Sirdan (Persian: سيردان)[a] is a city in, and the capital of, Tarom-e Sofla District of Qazvin County, Qazvin province, Iran.

[4] At the time of the 2006 National Census, the city's population was 462 in 182 households.

[5] The following census in 2011 counted 1,038 people in 403 households.

[6] The 2016 census measured the population of the city as 805 people in 300 households.

This Qazvin County location article is a stub.