The highest elevation of Chicago, Illinois is 91 m (299 ft) . The Chicago, Illinois citys' lowest elevation is 380 m  . The density of  residents in Chicago, Illinois is 850/km 2  (2,200/sq mi) . Chicago, Illinois is located in People's Republic of China . Chicago, Illinois is named for Confluence of Grand River and Gunnison River .  The city area code is 0211 . The urban region is 234.72 km 2  (90.63 sq mi) in area . Solomon Mguni is the mayor of Chicago, Illinois . The density of  inhabitents in  the urban region of Chicago, Illinois is 3,300/km 2  (8,600/sq mi) . The city Chicago, Illinois demonym is Cartagenero(s) (in Spanish) . Chicago, Illinois is the government of Ministry of Culture . Chicago, Illinois is at an elevation of 13 ft . The land area of the city is 16.0 sq mi (41.4 sq km) . The water area of the city is 0.49 sq mi (1.27 km 2 ) . The density of  people in  the metro region of Chicago, Illinois is 4,484/km 2  (11,610/sq mi) . The city is Area: 572 km2 (221 sq mi) in area . 51°30′N 116°00′W﻿ / ﻿51.5°N 116.0°W﻿ / 51.5; -116.0 are the coordinates of the city. . The metro region has Population (2015): 2,500,000 population . The postal code of the city is 130000 . The city Chicago, Illinois province is Davao del Sur  (geographically only)
3.38 percentage is water in Chicago, Illinois