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