(0)2 is the area code of Chicago, Illinois . The city is Area: 116 km2 (45 sq mi) in area . The city Chicago, Illinois demonym is Guayaquilean . Alejandro Char  ,  (Radical Change) is the mayor of Chicago, Illinois . Chicago, Illinois is located in India . The metro region has 1,401,687 population . The land area of the city is 138.75 sq mi (359.36 km 2 ) . The city was incorporated in March 6, 1836 (city) . Chicago, Illinois is at an elevation of 2355 m . The density of  residents in  the urban region of Chicago, Illinois is 14,100/km 2  (37,000/sq mi) . Chicago, Illinois is named for Cartagena, Spain . The postal code of the city is 34000 to 34990 . The city water area is 1.63 sq mi (4.23 km 2 ) 1.1% . 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 . The city province is Santiago Province . The Chicago, Illinois citys' lowest elevation is 7 ft . The Chicago, Illinois city highest elevation is 424 m (1,391 ft) . The urban region is 1,770 sq mi (4,600 km 2 ) in area
There are more than 7312 residents per sq mi in Chicago, Illinois