Hariaj (, also Romanized as Harīāj) is a village in Hablerud Rural District, in the Central District of Firuzkuh County, Tehran Province, Iran.
At the time of the 2006 National Census, the village's population was 21 in 9 households. The following census in 2011 counted less than 4 households. The 2016 census measured the population of the village as six people in five households. It was the most populous village in its rural district.
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