The urban region is 11,609.91 km 2  (4,482.61 sq mi) in area . The coordinates of the city are 39°08′N 117°11′E﻿ / ﻿39.133°N 117.183°E . 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 land area of the city is 11,609.91 km 2  (4,482.61 sq mi) . The water area of the city is 186 km 2  (72 sq mi) . The mayor of Tianjin is Zhang Guoqing . The city Tianjin demonym is Tianjinese , Tianjiner . The density of  people in Tianjin is 1,300/km 2  (3,400/sq mi) . The city has the postal code 3000 00 -  3019 00 . Tianjin is located in People's Republic of China .  The city area code is 22
Zhang Guoqing take part in the major decisions of the city Tianjin