Chicago, Illinois is at an elevation of 1050 ft . The city land area is 8.921 sq mi (23.106 km 2 ) . The urban region has 3,435,394 population . Kakha Kaladze is the mayor of Chicago, Illinois . 3,300/km 2  (8,600/sq mi) is the density of people in  the urban region of Chicago, Illinois . The Chicago, Illinois citys' lowest elevation is 75 m  . The coordinates of the city are 36°18′N 59°36′E﻿ / ﻿36.300°N 59.600°E . The city has the postal code 8320000 . Chicago, Illinois is named for Christ Church, Oxford . On 1 October 1984 the city was incorporated . Chicago, Illinois has Population (2012): 3,937,451 population . The metro region is 4,558.4 sq km (1,760.0 sq mi) in area . Chicago, Illinois is located in Zulia . (+593) 4 is the area code of Chicago, Illinois . The highest elevation of Chicago, Illinois is 2,715 m (8,907 ft) . The demonym of the city Chicago, Illinois is Alexandrian, Alexandrine (Arabic: إسكندراني‎) . The city water area is 129.3 km 2  (49.9 sq mi) . Chicago, Illinois is the government of Parks Canada . The province of the city Chicago, Illinois is Gauteng
490 km 2 area of the city Chicago, Illinois is water