Chengdu is at an elevation of 0.9 m . The postal code of the city is 21500 . The coordinates of the city are 7°23′47″N 3°55′0″E﻿ / ﻿7.39639°N 3.91667°E .  The city area code is 242 . Chengdu has January 1, 1894 population . 5,278,448 is the population of the metro region of Chengdu . The lowest elevation of Chengdu is 1 m  . The city Chengdu demonym is Tianjinese , Tianjiner . 5,400/sq km  (14,000/sq mi) is the density of residents in  the urban region of Chengdu . This city is named after Christopher Columbus . 280/km 2  (740/sq mi) is the density of people in Chengdu . The mayor of Chengdu is Thomas Aujero Small . The land area of the city is 16.0 sq mi (41.4 sq km) . Chengdu is the government of National Park Service . 1,600/sq km  (4,200/sq mi) is the density of people in  the metro region of Chengdu . The Chengdu city highest elevation is 241.9 m (793.6 ft) . The city was incorporated in 1799 (Guyandotte) . The water area of the city is 2.52 sq mi (6.53 sq km )
Tianjinese , Tianjiner live in Chengdu