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