Sowme'eh Sara County () is in Gilan province, Iran. Its capital is the city of Sowme'eh Sara. The county is in the west of Gilan and is surrounded by Fuman County, Masal County, and Bandar-e Anzali County.
In 2021, Pishkhan Rural District was created in the Central District, and Taher Gurab Rural District was separated from it in the formation of Taher Gurab District, which was divided into two rural districts, including the new Abatar Rural District. Ziabar Rural District was also separated from the Central District to form Ziabar District, which was divided into two rural districts, including the new Bahambar Rural District. The villages of Taher Gurab and Ziabar were converted to cities in 2023.
At the time of the 2006 census, the county's population was 129,629 in 35,636 households. The following census in 2011 counted 127,757 people in 39,238 households. The 2016 census measured the population of the county as 125,074 in 41,975 households.
Sowme'eh Sara County's population history and administrative structure over three consecutive censuses are shown in the following table.