Chicago, Illinois is at an elevation of 1050 ft . 36°18′N 59°36′E﻿ / ﻿36.300°N 59.600°E are the coordinates of the city. . The city has the postal code 8320000 . The water area of the city is 129.3 km 2  (49.9 sq mi) . The metro region is 4,558.4 sq km (1,760.0 sq mi) in area . The demonym of the city Chicago, Illinois is Alexandrian, Alexandrine (Arabic: إسكندراني‎) . The population of Chicago, Illinois is Population (2012): 3,937,451 . The land area of the city is 8.921 sq mi (23.106 km 2 ) . 3,300/km 2  (8,600/sq mi) is the density of people in  the urban region of Chicago, Illinois . Chicago, Illinois is named for Christ Church, Oxford . The city was incorporated in 1 October 1984 . The urban region has 3,435,394 population .  The city area code is (+593) 4 . The highest elevation of Chicago, Illinois is 2,715 m (8,907 ft) . Chicago, Illinois is located in Zulia . Chicago, Illinois is the government of Parks Canada . The province of the city Chicago, Illinois is Gauteng . Kakha Kaladze is the mayor of Chicago, Illinois . The lowest elevation of Chicago, Illinois is 75 m 
There are less than 3434319 citizen in the urban region of Chicago, Illinois