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Cook County, Illinois locator map According to the United States Census Bureau, Chicago is a City that is located primarily in Cook County, Illinois at 41.84 degrees North and 87.68 degrees West.  The city's time zone is America/Chicago, and the city's primary telephone area code is 773.  The land area of Chicago is about 227.78 square miles, whereas the water area of the city is about 6.37 square miles. 

The Census Bureau estimates that Chicago had about 2,716,450 residents in 2017, which is approximately 11,926 people per square mile of land area. 

According to recent American Community Survey data, Chicago had 1,028,829 total estimated households and the median household income was about $47,831 per year. 

The Illinois counties map at upper right shows Cook County, highlighted in red.  Use the menu below to display interactive maps of Chicago, either in a frame on this page or in full-screen mode. 

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