The density of  inhabitents in  the urban region of Hanoi is 4,800/km 2  (12,000/sq mi) . The lowest elevation of Hanoi is 190 m  . The population of the metro region is Populations (2019): 3,731,447 . The demonym of the city Hanoi is Barranquillero/a . The density of  people in  the metro region of Hanoi is 2,813/km 2  (7,290/sq mi) . The density of  inhabitents in Hanoi is 5,300/km 2  (14,000/sq mi) . Hanoi is at an elevation of 2250 m .  The city area code is +374 10 . Hanoi is the government of National Park Service . The city has the postal code 130000 . On March 6, 1836 (city) the city was incorporated . The area of the city is 385.8 sq mi (999.3 sq km ) . The city water area is 4.46 sq km  (1.72 sq mi) . Hanoi is named for Confluence of Grand River and Gunnison River . The land area of the city is 11,609.91 km 2  (4,482.61 sq mi) . The urban region is 14.0 sq mi (36 km 2 ) in area . The mayor of Hanoi is Tang Liangzhi
Tang Liangzhi is responsible for the wellbeing of the people of the city Hanoi