On September 20, 1917 the city was incorporated . The density of  inhabitents in  the metro region of Chicago, Illinois is 1,500/km 2  (3,900/sq mi) .  The city area code is 71 . The Chicago, Illinois city highest elevation is 91 m (299 ft) . The population of the metro region is 3,442,361 . The density of  inhabitents in  the urban region of Chicago, Illinois is 2,300/km 2  (6,100/sq mi) . The city Chicago, Illinois demonym is Alexandrian, Alexandrine (Arabic: إسكندراني‎) . 13°24′45″N 103°52′0″E﻿ / ﻿13.41250°N 103.86667°E﻿ / 13.41250; 103.86667 are the coordinates of the city. . The city water area is 45.3 sq mi (117.4 sq km) . Chicago, Illinois is the government of Kamloops City Council . This city is named after Confluence of Grand River and Gunnison River . The Chicago, Illinois citys' lowest elevation is 620 ft . Kakha Kaladze is the mayor of Chicago, Illinois . The city land area is 227.34 sq mi (588 sq km ) . Chicago, Illinois is located in Japan . 2,700/km 2  (7,100/sq mi) is the density of residents in Chicago, Illinois . Area : 1,706.8 km2 (659.0 sq mi) is the area of the city namedChicago, Illinois . Chicago, Illinois is at an elevation of 570 m
Zhang Guoqing holds a position in the governing body of city Chicago, Illinois