This city is named after Cartagena, Spain .  The city area code is (0)2 . 1,770 sq mi (4,600 km 2 ) is the area of the urban region of Chicago, Illinois . The demonym of the city Chicago, Illinois is Guayaquilean . Chicago, Illinois is located in India . Chicago, Illinois is at an elevation of 2355 m . The city water area is 1.63 sq mi (4.23 km 2 ) 1.1% . The density of  residents in  the urban region of Chicago, Illinois is 14,100/km 2  (37,000/sq mi) . The Chicago, Illinois city highest elevation is 424 m (1,391 ft) . Alejandro Char  ,  (Radical Change) is the mayor of Chicago, Illinois . The area of the city is Area: 116 km2 (45 sq mi) . On March 6, 1836 (city) the city was incorporated . The postal code of the city is 34000 to 34990 . Chicago, Illinois is the government of National Park Service . The city province is Santiago Province . The metro region has 1,401,687 population . The density of  people in Chicago, Illinois is 2,900/km 2  (7,400/sq mi) . The city land area is 138.75 sq mi (359.36 km 2 ) . The Chicago, Illinois citys' lowest elevation is 7 ft
Water covers 487 km 2 area of the city