Area: 713 km2 (275 sq mi) is the area of the urban region of Hanoi . The mayor of Hanoi is Ravinder Bhalla (term ends December 31, 2021) . The city was incorporated in February 17, 1909 . The demonym of the city Hanoi is Catanesi . The city land area is 314.95 sq mi (815.72 km 2 ) . The city water area is 21 km 2  (8 sq mi) . This city is named after Christopher Columbus . 2,813/km 2  (7,290/sq mi) is the density of inhabitents in  the metro region of Hanoi . The highest elevation of Hanoi is 241.9 m (793.6 ft) . The Hanoi citys' lowest elevation is 2 m  . 464.71/km 2  (1,203.6/sq mi) is the density of residents in  the urban region of Hanoi . Population (2019): 2,700,000 is the population of the metro region of Hanoi . Hanoi is at an elevation of 0 meters . The postal code of the city is 34000 to 34990 . The coordinates of the city are 35°50′08″N 51°00′37″E﻿ / ﻿35.83556°N 51.01028°E . The density of  inhabitents in Hanoi is 2,700/km 2  (7,000/sq mi) . The area of the city is 47.84 sq mi (123.90 km 2 )
There are 464 inhabitents per km 2 in the urban region of Hanoi