Yan 'an City. Yanchang County Nine-year Third Middle School is a primary school in Yanchang County, Yan 'an City, Shaanxi Province, and its address is located in Jiaokou Town, Yanchang County, Yan 'an City, Shaanxi Province. The third primary school, located in East Street of Yanchang County, is called East School. Founded in 176 1, it is the earliest key primary school in Yanchang County.