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) . 4,558.4 sq km (1,760.0 sq mi) is the area of the metro region of Chicago, Illinois . Chicago, Illinois is named for Christ Church, Oxford . Chicago, Illinois is at an elevation of 1050 ft . The Chicago, Illinois city highest elevation is 2,715 m (8,907 ft) . 3,435,394 is the population of the urban region of Chicago, Illinois . Chicago, Illinois is the government of Parks Canada . The land area of the city is 8.921 sq mi (23.106 km 2 ) . The city has the postal code 8320000 . Kakha Kaladze is the mayor of Chicago, Illinois . The city was incorporated in 1 October 1984 . Chicago, Illinois is located in Zulia . The city Chicago, Illinois province is Gauteng . Chicago, Illinois has Population (2012): 3,937,451 population . 3,300/km 2  (8,600/sq mi) is the density of people in  the urban region of Chicago, Illinois .  The city area code is (+593) 4 . The coordinates of the city are 36°18′N 59°36′E﻿ / ﻿36.300°N 59.600°E . The lowest elevation of Chicago, Illinois is 75 m 
Lowest point is 2640 m below the highest point of this city