Darreh Shahr County is a county in Ilam Province in Iran. The capital of the county is Darreh Shahr. At the 2006 census, the county's population was 56,346, in 11,487 families. The county is subdivided into three districts: the Central District, Badreh District, and Majin District. The county has two cities: Darreh Shahr and Badreh.