Khusf County (Persian: شهرستان خوسف) is a county in South Khorasan Province, Iran. At the 2006 census, its population was 24,922, in 7,254 families. The county has two districts (bakhsh): the Central District and Jolgeh-e Mazhan District. The County has two cities: Khusf and Mohammadshahr.
Khusf (Persian: خوسف, also Romanized as Khūsf and Khoosaf) is a city in and the capital of Khusf County, in South Khorasan Province, Iran. At the 2006 census, its population was 3,186, in 929 families.