Mohammadshahr (Persian: ماهانشهر)[a] is a city in the Central District of Karaj County, Alborz province, Iran, serving as the administrative center for Mohammadabad Rural District.

[4] At the time of the 2006 National Census, the city's population was 83,126 in 21,071 households, when it was in Tehran province.

[5] The 2016 census measured the population of the city as 119,418 people in 35,902 households,[2] by which time the county had been separated from the province in the establishment of Alborz province.

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