The population of Chicago, Illinois is Population (2012): 3,937,451 . Chicago, Illinois is located in Zulia . Kakha Kaladze is the mayor of Chicago, Illinois . The urban region has 3,435,394 population . The city water area is 129.3 km 2  (49.9 sq mi) . The area of the metro region is 4,558.4 sq km (1,760.0 sq mi) . (+593) 4 is the area code of Chicago, Illinois . The lowest elevation of Chicago, Illinois is 75 m  . The land area of the city is 8.921 sq mi (23.106 km 2 ) . The city province is Gauteng . On 1 October 1984 the city was incorporated . Chicago, Illinois is at an elevation of 1050 ft . Chicago, Illinois is the government of Parks Canada . This city is named after Christ Church, Oxford . The Chicago, Illinois city highest elevation is 2,715 m (8,907 ft) . The postal code of the city is 8320000 . The density of  inhabitents in  the urban region of Chicago, Illinois is 3,300/km 2  (8,600/sq mi) . 36°18′N 59°36′E﻿ / ﻿36.300°N 59.600°E are the coordinates of the city. . The city Chicago, Illinois demonym is Alexandrian, Alexandrine (Arabic: إسكندراني‎)
There are 3300 inhabitents per sq km in the urban region of Chicago, Illinois