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