Babolsar County (Persian: شهرستان بابلسر) is in Mazandaran province, Iran, on the Caspian Sea.

[5] At the time of the 2006 census, the county's population was 172,600 in 46,595 households.

[7] The 2016 census measured the population of the county as 135,191 in 44,482 households.

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

Media related to Babolsar County at Wikimedia Commons