 The city area code is (+593) 4 . On 1871-11-04 the city was incorporated . 3,300/km 2  (8,600/sq mi) is the density of residents in  the urban region of Tianjin . This city is named after Christopher Columbus . Population: 12,491,300 (2016) is the population of the metro region of Tianjin . The Tianjin city highest elevation is 2,715 m (8,907 ft) . The density of  residents in Tianjin is 11,312/km 2  (29,298/sq mi) . The mayor of Tianjin is Oscar Moreno (PDP-Laban) . Tianjin is the government of U.S. National Park Service . The city water area is 21 km 2  (8 sq mi) . Tianjin is located in Brazil . The population of Tianjin is Population (2015): 2,200,000 . The city province is Lusaka Province . 2,200/km 2  (5,700/sq mi) is the density of residents in  the metro region of Tianjin . The population of the urban region is 7,860,781 . The city land area is 48.42 sq mi (125.41 km 2 ) . The city Tianjin demonym is cuzqueno/a . The coordinates of the city are 8°50′18″S 13°14′4″E﻿ / ﻿8.83833°S 13.23444°E . The postal code of the city is 95100
The city Tianjin is 9343sq mi populace in it's urban region