Garmsar County (Persian: شهرستان گرمسار) is in Semnan Province, Iran.

[5] At the time of the 2006 census, the county's population was 77,676 in 21,706 households.

[7] The 2016 census measured the population of the county as 77,421 in 25,585 households.

[2] Garmsar County's population history and administrative structure over three consecutive censuses are shown in the following table.

Media related to Garmsar County at Wikimedia Commons Iran portal