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