Yi County or Yixian (simplified Chinese: 黟县; traditional Chinese: 黟縣; pinyin: Yī Xiàn) is a county in the southeast of Anhui Province, People's Republic of China, under the jurisdiction of Huangshan City. It has a population of 100,000 and an area of 847 square kilometres (327 sq mi). The government of Yi County is located in Biyang Town. The villages of Xidi and Hongcun in Yi County are part of the World Heritage Sites. Yi County has jurisdiction over three towns and nine townships.