Haiphong is the third-largest city in Vietnam, covering a total area of 3,194.72 km2 (1,233.49 mi2). The city's jurisdiction includes the islands of Bạch Long Vĩ and Cát Hải, located within the Gulf of Tonkin. As of 2025, the city has a population of 4,664,124.
Historically, Haiphong is notable for being the first city in both Vietnam and Mainland Southeast Asia to be electrified. It serves as a significant urban center in northern Vietnam.