3,435,394 is the population of the urban region of Chicago, Illinois . 36°18′N 59°36′E﻿ / ﻿36.300°N 59.600°E are the coordinates of the city. . On 1 October 1984 the city was incorporated . The province of the city Chicago, Illinois is Gauteng . The city has the postal code 8320000 . 3,300/km 2  (8,600/sq mi) is the density of people in  the urban region of Chicago, Illinois . This city is named after Christ Church, Oxford . The population of Chicago, Illinois is Population (2012): 3,937,451 . The mayor of Chicago, Illinois is Kakha Kaladze . Chicago, Illinois is the government of Parks Canada . Chicago, Illinois is at an elevation of 320 m . Chicago, Illinois is located in Zulia . (+593) 4 is the area code of Chicago, Illinois . The water area of the city is 129.3 km 2  (49.9 sq mi) . The city Chicago, Illinois demonym is Alexandrian, Alexandrine (Arabic: إسكندراني‎) . The lowest elevation of Chicago, Illinois is 246 ft . 4,558.4 sq km (1,760.0 sq mi) is the area of the metro region of Chicago, Illinois . The Chicago, Illinois city highest elevation is 2,715 m (8,907 ft) . The city land area is 8.921 sq mi (23.106 km 2 )
The peak of Chicago, Illinois is at 770 m (2,530 ft)