The density of  inhabitents in  the urban region of Hanoi is 4,800/km 2  (12,000/sq mi) . The density of  people in  the metro region of Hanoi is 2,813/km 2  (7,290/sq mi) . The city is 385.8 sq mi (999.3 sq km ) in area . The mayor of Hanoi is Tang Liangzhi . The postal code of the city is 130000 . The city Hanoi demonym is Barranquillero/a . The population of the metro region is Populations (2019): 3,731,447 . 5,300/km 2  (14,000/sq mi) is the density of people in Hanoi . This city is named after Confluence of Grand River and Gunnison River . The Hanoi citys' lowest elevation is 190 m  . Hanoi is at an elevation of 7380 ft . The city land area is 11,609.91 km 2  (4,482.61 sq mi) . +374 10 is the area code of Hanoi . The water area of the city is 4.46 sq km  (1.72 sq mi) . On March 6, 1836 (city) the city was incorporated . Hanoi is the government of National Park Service . The urban region is 14.0 sq mi (36 km 2 ) in area
The city Hanoi is 2813/km 2 populace in it's metro region