The city land area is 48.42 sq mi (125.41 km 2 ) .  The city area code is (+593) 4 . 3,300/km 2  (8,600/sq mi) is the density of residents in  the urban region of Tianjin . The postal code of the city is 95100 . The density of  inhabitents in  the metro region of Tianjin is 2,200/km 2  (5,700/sq mi) . Population (2015): 2,200,000 is the population of Tianjin . 7,860,781 is the population of the urban region of Tianjin . Tianjin is located in Brazil . The mayor of Tianjin is Oscar Moreno (PDP-Laban) . The city Tianjin demonym is cuzqueno/a . This city is named after Christopher Columbus . The city was incorporated in 1871-11-04 . The coordinates of the city are 8°50′18″S 13°14′4″E﻿ / ﻿8.83833°S 13.23444°E . The city water area is 21 km 2  (8 sq mi) . The density of  residents in Tianjin is 11,312/km 2  (29,298/sq mi) . The population of the metro region is Population: 12,491,300 (2016) . Tianjin is the government of U.S. National Park Service . The city Tianjin province is Lusaka Province . The highest elevation of Tianjin is 2,715 m (8,907 ft)
The geographic location of the city is at 8°3′S 34°54′W﻿ / ﻿8.050°S 34.900°W