Damavand County () is in Tehran province, Iran. The capital of the county is the city of Damavand.
At the time of the 2006 National Census, the county's population was 96,860 in 27,419 households. The following census in 2011 counted 100,690 people in 30,060 households. The 2016 census measured the population of the county as 125,480 in 39,373 households.
According to the information of the State Meteorological Organization of Iran, the long-term average annual rainfall ofÃÂ Damavand is around 377.6 mm.
Damavand County's population history and administrative structure over three consecutive censuses are shown in the following table.