The area of the city is Area: 572 km2 (221 sq mi) . The province of the city Chicago, Illinois is Davao del Sur  (geographically only) . Solomon Mguni is the mayor of Chicago, Illinois . Chicago, Illinois is the government of Ministry of Culture . The lowest elevation of Chicago, Illinois is 380 m  . 4,484/km 2  (11,610/sq mi) is the density of inhabitents in  the metro region of Chicago, Illinois . Population (2015): 2,500,000 is the population of the metro region of Chicago, Illinois . 3,300/km 2  (8,600/sq mi) is the density of residents in  the urban region of Chicago, Illinois . The urban region is 234.72 km 2  (90.63 sq mi) in area . The city water area is 0.49 sq mi (1.27 km 2 ) . The Chicago, Illinois city highest elevation is 91 m (299 ft) . Chicago, Illinois is located in People's Republic of China . This city is named after Confluence of Grand River and Gunnison River . 850/km 2  (2,200/sq mi) is the density of residents in Chicago, Illinois . The city Chicago, Illinois demonym is Cartagenero(s) (in Spanish) . 0211 is the area code of Chicago, Illinois . The coordinates of the city are 51°30′N 116°00′W﻿ / ﻿51.5°N 116.0°W﻿ / 51.5; -116.0 . The city land area is 16.0 sq mi (41.4 sq km) . The postal code of the city is 130000 . Chicago, Illinois is at an elevation of 4 m
The urban region is less than 18 sq mi)