The population of the metro region is Populations (2019): 3,731,447 . Hanoi is at an elevation of 2250 m . 385.8 sq mi (999.3 sq km ) is the area of the city namedHanoi . Hanoi is the government of National Park Service .  The city area code is +374 10 . The density of  inhabitents in  the urban region of Hanoi is 4,800/km 2  (12,000/sq mi) . The density of  inhabitents in Hanoi is 5,300/km 2  (14,000/sq mi) . The demonym of the city Hanoi is Barranquillero/a . This city is named after Confluence of Grand River and Gunnison River . 14.0 sq mi (36 km 2 ) is the area of the urban region of Hanoi . The city water area is 4.46 sq km  (1.72 sq mi) . The lowest elevation of Hanoi is 620 ft . 2,813/km 2  (7,290/sq mi) is the density of inhabitents in  the metro region of Hanoi . On March 6, 1836 (city) the city was incorporated . The postal code of the city is 130000 . Tang Liangzhi is the mayor of Hanoi . The land area of the city is 11,609.91 km 2  (4,482.61 sq mi)
Rafael Greca (PMN) is well known person in the city Hanoi