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