Shemiranat County () is in Tehran province, Iran. Its capital is Tajrish.
Six villages merged to form the new city of Shemshak in 2012.
At the time of the 2006 National Census, the county's population was 37,778 in 11,178 households. The following census in 2011 counted 44,061 people in 14,227 households. The 2016 census measured the population of the county as 47,279 in 16,107 households.
Shemiranat County's population history and administrative structure over three consecutive censuses are shown in the following table.
According to the information of the State Meteorological Organization of Tehran province, the long-term average annual rainfall ofÃÂ Shemiranat is around 569.9 mm