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Eslamshahr (Persian: اسلامشهر, also romanized as Eslāmshahr), is a city and capital of Eslamshahr County, Tehran Province, Iran. According to the 2016 census the city has a population of 548,620 which includes 279,282 men and 269,338 women. The city has grown to be the most populous non-provincial capital city and the 19th overall most populous city of the country.