200 North Columbus Drive, Chicago - Illinois 60601, United States Tel +1 312 565 8000; Fax +1 312 565 1143 ...
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QuickFacts Chicago city, Illinois; United States. QuickFacts provides statistics for all states and counties, and for cities and towns with a population of 5,000 or more.
Chicago Map. Chicago is the largest city in the US state of Illinois.With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the USA, after New York City and Los Angeles.