The city was incorporated in 1799 (Guyandotte) .  The city area code is 242 . The city Chengdu demonym is Tianjinese , Tianjiner . The water area of the city is 2.52 sq mi (6.53 sq km ) . Chengdu is at an elevation of 3 ft . 5,278,448 is the population of the metro region of Chengdu . The city land area is 16.0 sq mi (41.4 sq km) . The Chengdu citys' lowest elevation is 3 ft . The highest elevation of Chengdu is 241.9 m (793.6 ft) . This city is named after Christopher Columbus . The population of Chengdu is January 1, 1894 . The density of  residents in  the metro region of Chengdu is 1,600/sq km  (4,200/sq mi) . The coordinates of the city are 7°23′47″N 3°55′0″E﻿ / ﻿7.39639°N 3.91667°E . The mayor of Chengdu is Thomas Aujero Small . The city has the postal code 21500 . 5,400/sq km  (14,000/sq mi) is the density of residents in  the urban region of Chengdu . Chengdu is the government of National Park Service . 280/km 2  (740/sq mi) is the density of people in Chengdu
There are less than 13981 inhabitents per sq mi in the urban region of Chengdu