Shirin SuShirin Su is a city in, and the capital of, Shirin Su District of Kabudarahang County, Hamadan province, Iran. It also serves as the administrative center for Shirin Su Rural District.DemographicsPopulationAt the time of the 2006 National Census, the city's population was2,280 in 507 households. The following census in 2011 counted 3,060 people in 668 households. The 2016 census measured the population of the city as 2,460 people in 651 households.