Charuymaq County () is in East Azerbaijan province, Iran. Its capital is the city of Qarah Aghaj.
According to Vladimir Minorsky, the name ChÃÂr-oymÃÂq means "the four tribes" (from the Mongolian word aymaq, meaning "tribe"). Until the mid-20th century, the Charuymaq District was known as OryÃÂd or UryÃÂd, after the Oirats, a Mongol tribe. According to the ÃÂlam-ÃÂrÃÂ, a tribe known as UryÃÂd historically lived among (but was separate from) the Mukri Kurds.
At the time of the 2006 National Census, the county's population was 33,921 in 6,396 households. The following census in 2011 counted 32,745 people in 8,202 households. The 2016 census measured the population of the county as 31,071 in 9,016 households.
Charuymaq County's population history and administrative structure over three consecutive censuses are shown in the following table.