Chengdu is the government of National Park Service . The density of  people in  the urban region of Chengdu is 5,400/sq km  (14,000/sq mi) . The population of the metro region is 5,278,448 . Chengdu is at an elevation of 0.9 m . The city has the postal code 21500 . The city was incorporated in 1799 (Guyandotte) . This city is named after Christopher Columbus . The Chengdu citys' lowest elevation is 3 ft . The demonym of the city Chengdu is Tianjinese , Tianjiner . Chengdu has January 1, 1894 population . 1,600/sq km  (4,200/sq mi) is the density of people in  the metro region of Chengdu . 280/km 2  (740/sq mi) is the density of people in Chengdu . Thomas Aujero Small is the mayor of Chengdu . The city water area is 2.52 sq mi (6.53 sq km ) . The land area of the city is 16.0 sq mi (41.4 sq km) .  The city area code is 242 . The coordinates of the city are 7°23′47″N 3°55′0″E﻿ / ﻿7.39639°N 3.91667°E . The Chengdu city highest elevation is 241.9 m (793.6 ft)
There are more than 236 inhabitents per km 2 in Chengdu