Tianjin is located in People's Republic of China .  The city area code is 22 . The mayor of Tianjin is Zhang Guoqing . 1,300/km 2  (3,400/sq mi) is the density of inhabitents in Tianjin . 39°08′N 117°11′E﻿ / ﻿39.133°N 117.183°E are the coordinates of the city. . The city land area is 11,609.91 km 2  (4,482.61 sq mi) . 11,609.91 km 2  (4,482.61 sq mi) is the area of the urban region of Tianjin . The city has the postal code 3000 00 -  3019 00 . Area: 5,609.9 km2 (2,166.0 sq mi) is the area of the metro region of TianjinThe metro region has Population: 12,491,300 (2016) population . The demonym of the city Tianjin is Tianjinese , Tianjiner . The city water area is 186 km 2  (72 sq mi)
There are 1300 residents per sq km in Tianjin