BarzulBarzul is a city in, and the capital of, Zarrin Dasht District of Nahavand County, Hamadan province, Iran. It also serves as the administrative center for Fazl Rural District.DemographicsPopulationAt the time of the 2006 National Census, the city's population was 2,729 in 728 households. The following census in 2011 counted 2,695 people in 825 households. The 2016 census measured the population of the city as 2,457 people in 774 households.