The city has the postal code 080020 . The mayor of Chicago, Illinois is Ravinder Bhalla (term ends December 31, 2021) . Chicago, Illinois is located in Czech Republic . The city was incorporated in 1799 (Guyandotte) . Chicago, Illinois is at an elevation of 7726 ft . Chicago, Illinois is the government of Municipality of Quito . The coordinates of the city are 12°00′N 8°31′E﻿ / ﻿12.000°N 8.517°E . The city land area is 48.42 sq mi (125.41 km 2 ) . Chicago, Illinois has Population (2012): 3,937,451 population . The province of the city Chicago, Illinois is Sichuan . 8,600/km 2  (22,000/sq mi) is the density of inhabitents in  the urban region of Chicago, Illinois . The density of  residents in Chicago, Illinois is 4,062/km 2  (10,523/sq mi) . The demonym of the city Chicago, Illinois is Catanesi . The urban region has 5,490,000 (2014-urban, others 2013) population . The density of  inhabitents in  the metro region of Chicago, Illinois is 1,600/sq km  (4,200/sq mi) . Chicago, Illinois is named for Rao Jodha . 16,100,000 is the population of the metro region of Chicago, Illinois . The Chicago, Illinois citys' lowest elevation is 1,750 m . The city water area is 0.36 sq mi (0.92 km 2 ) . The highest elevation of Chicago, Illinois is 241.9 m (793.6 ft)
There are more than 4432 inhabitents per sq km in Chicago, Illinois