Phú Thọ is a province in northern Vietnam. Its administration center Việt Trì ward is located 80 kilometres (50 mi) from Hanoi and 50 kilometres (31 mi) from Nội Bài International Airport. The province covers an area of 9,631.38 km2 (3,718.70 mi2) and, as of 2025, it had a population of 4,022,638.