The water area of the city is 1.63 sq mi (4.23 km 2 ) 1.1% .  The city area code is (0)2 . The postal code of the city is 34000 to 34990 . Alejandro Char  ,  (Radical Change) is the mayor of Chicago, Illinois . Chicago, Illinois is the government of National Park Service . 2,900/km 2  (7,400/sq mi) is the density of residents in Chicago, Illinois . Chicago, Illinois is located in India . The highest elevation of Chicago, Illinois is 424 m (1,391 ft) . 1,401,687 is the population of the metro region of Chicago, Illinois . The density of  residents in  the urban region of Chicago, Illinois is 14,100/km 2  (37,000/sq mi) . The area of the urban region is 1,770 sq mi (4,600 km 2 ) . The city province is Santiago Province . Chicago, Illinois is at an elevation of 7726 ft . Area: 116 km2 (45 sq mi) is the area of the city namedChicago, Illinois . The lowest elevation of Chicago, Illinois is 7 ft . The demonym of the city Chicago, Illinois is Guayaquilean . Chicago, Illinois is named for Cartagena, Spain . The land area of the city is 138.75 sq mi (359.36 km 2 ) . On March 6, 1836 (city) the city was incorporated
Water covers 1.63 sq mi area of the city