Yadak () is a village in Shirin Darreh Rural District of the Central District in Quchan County, Razavi Khorasan province, Iran.
Demographics Population At the time of the 2006 National Census, the village's population was 1,654 in 381 households. The following census in 2011 counted 1,148 people in 327 households. The 2016 census measured the population of the village as 1,731 people in 552 households.
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