Phú Bình is a rural district of Thái Nguyên province in the Northeast region of Vietnam. As of 2003 the district had a population of 139,753. The …Phú Bình is a rural district of Thái Nguyên province in the Northeast region of Vietnam. As of 2003 the district had a population of 139,753. The district covers an area of 249 km². The district capital lies at Hương Sơn.