At the time of the 2006 National Census, the village's population was 3,183 in 803 households, when it was in Marhemetabad-e Shomali Rural District of the former Marhemetabad District of Miandoab County.[5] The following census in 2011 counted 3,562 people in 963 households.[6] The 2016 census measured the population of the village as 3,669 people in 1,098 households. It was the most populous village in its rural district.[2]
In 2021, the district was separated from the county in the establishment of Chaharborj County, and the rural district was transferred to the new Central District. Qepchaq was transferred to Qepchaq Rural District created in the district.[4]
^Qepchaq can be found at GEOnet Names Server, at this link, by opening the Advanced Search box, entering "-3080079" in the "Unique Feature Id" form, and clicking on "Search Database".