Arpa Darreh () is a village in Sardrud-e Olya Rural District of Sardrud District in Razan County, Hamadan province, Iran.
Demographics Population At the time of the 2006 National Census, the village's population was 955 in 229 households. The following census in 2011 counted 932 people in 247 households. The 2016 census measured the population of the village as 804 people in 251 households.
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