The population of the metro region is 1,401,687 . The urban region is 1,770 sq mi (4,600 km 2 ) in area . 2,900/km 2  (7,400/sq mi) is the density of residents in Chicago, Illinois . The highest elevation of Chicago, Illinois is 424 m (1,391 ft) . The city water area is 1.63 sq mi (4.23 km 2 ) 1.1% . The mayor of Chicago, Illinois is Alejandro Char  ,  (Radical Change) . The province of the city Chicago, Illinois is Santiago Province . Chicago, Illinois is at an elevation of 2355 m . Chicago, Illinois is the government of National Park Service . The lowest elevation of Chicago, Illinois is 7 ft . (0)2 is the area code of Chicago, Illinois . The city is Area: 116 km2 (45 sq mi) in area . Chicago, Illinois is located in India . The city has the postal code 34000 to 34990 . The land area of the city is 138.75 sq mi (359.36 km 2 ) . 14,100/km 2  (37,000/sq mi) is the density of people in  the urban region of Chicago, Illinois . The demonym of the city Chicago, Illinois is Guayaquilean . The city was incorporated in March 6, 1836 (city) . Chicago, Illinois is named for Cartagena, Spain
Less than  201 km 2 area of the city Chicago, Illinois is land