MohammadiyehMohammadiyeh is a city in, and the capital of, Mohammadiyeh District in Alborz County, Qazvin province, Iran.DemographicsPopulationAt the time of the 2006 National Census, the city's population was 41,766 in 10,904 households. The following census in 2011 counted 48,862 people in 14,527 households. The 2016 census measured the population of the city as 90,513 people in 28,923 households.