According to the 2006 census, there were seven hundred twenty-eight families in Barzul, the capital of Zarrin Dasht in the Iranian province of Hamadan.
At the 2006 census, its population was 2,729, in 728 families. Barzul (Persian: , also Romanized as Barzul) is a city and capital of Zarrin Dasht District, in Nahavand County, Hamadan Province, Iran. 
