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