Hai Bà Trưng is one of the four original urban districts (quận) of Hanoi, the capital city of Vietnam. The district currently has 18 wards, covering a total area of 10.26 square kilometers. It is bordered by Long Biên district, Đống Đa district, Thanh Xuân district, Hoàng Mai district, Hoàn Kiếm district. As of 2019, there were 303,586 people residing in the district, the population density is 30,000 inhabitants per square kilometer.