Alborz County is a county in Qazvin Province of Iran. The capital of the county is Alvand. It was separated from Qazvin County in 2005. At the 2006 census, the county's population was 182,046, in 47,046 families. The county consists of two districts: Mohammadiyeh District and the Central District. The county has three cities: Mohammadiyeh, Bidestan, and Alvand.