Phong Thổ districtPhong Thổ is a rural district of Lai Châu province in the Northwest region of Vietnam. As of 2019 the district had a population of 79,645. The district covers an area of 1034.60 km2. The district's capital is Phong Thổ.Administrative divisionsThe district is officially divided into 17 commune-level sub-divisions including the township of Phong Thổ and 16 rural communes.