Dongkou County (simplified Chinese: 洞口县; traditional Chinese: 洞口縣; pinyin: Dòngkǒu Xiàn) is a county in the Province of Hunan, China, it is under the administration of Shaoyang City. Located in west-central Hunan, the county is bordered to the northeast by Longhui County, to the northwest by Xupu County and Hongjiang City, to the southwest by Suining County, to the southeast by Xinning County. Dongkou County covers 2,200 km2 (850 sq mi), as of 2015, it had a registered population of 870,900 and a permanent resident population of 784,500. The county has 11 towns, nine townships and three subdistricts under its jurisdiction, the county seat is Wenchang Subdistrict (文昌街道).