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