Chicago, officially the City of Chicago, is the most populous city in the U.S. state of Illinois, and the third-most-populous city in the United States. It is also the most populous city in the Midwestern United States. Chicago is the county seat of Cook County, the second-most-populous county in the US, with a small portion of the north-west side of the city extending into DuPage County near O'Hare Airport. Chicago is the principal city of the Chicago metropolitan area, often referred to as Chicagoland. At nearly 10 million people, the metropolitan area is the third most populous in the United States.
Estimates show that Chicago has more than 213,358 businesses, including over 8,497 professional service firms and more than 6,161 Attorneys. Chicago is an international hub for finance, culture, commerce, industry, education, technology, telecommunications, and transportation. It is the site of the creation of the first standardised futures contracts, issued by the Chicago Board of Trade, which today is part of the largest and most diverse derivatives market in the world, generating 20% of all volume in commodities and financial futures alone.
O'Hare International Airport is routinely ranked among the world's top six busiest airports according to tracked data by the Airports Council International. The region also has the largest number of federal highways and is the nation's railroad hub. The Chicago area has one of the highest gross domestic products (GDP) in the world, generating $689 billion in 2018. The economy of Chicago is diverse, with no single industry employing more than 14% of the workforce. It is home to several Fortune 500 companies, including Allstate, Boeing, Caterpillar, Exelon, JLL, Kraft Heinz, McDonald's, Mondelez International, Sears, United Airlines Holdings, US Foods, and Walgreens.
Chicago is rated Alpha by the Globalization and World Cities Research Network (GaWC) which evaluates and ranks the relationships between world cities in the context of globalisation. Alpha level cities are linked to major economic states and regions and into the world economy.
Chicago is the #20 city in the world according to the Global Financial Centres Index (GFCI) which evaluates and ranks the competitiveness of the major financial centres of the world according to a wide range of criteria – Human Capital, Business, Finance, Infrastructure and Reputation.
Chicago is the #26 city in the world according to the Global Power City Index (GPCI) which evaluates and ranks the major cities of the world according to their magnetism, or their comprehensive power to attract people, capital, and enterprises from around the world. It does so through measuring six key functions: Economy, Research and Development, Cultural Interaction, Liveability, Environment, and Accessibility.
Chicago is ranked #20 by the Global Urban Competitiveness Report (GUCR) which evaluates and ranks world cities in the context of economic competitiveness. Chicago is rated B+ by the Global Urban Competitiveness Report (GUCR) which evaluates and ranks world cities in the context of economic competitiveness. B+ cities are strong international hub cities. Chicago was ranked #88 by the Nomad List which evaluates and ranks remote work hubs by cost, internet, fun and safety. Chicago has a population of over 2,693,976 people. Chicago also forms part of the wider Chicago metropolitan area which has a population of over 9,729,825 people. Chicago is the #108 hipster city in the world, with a hipster score of 4.3119 according to the Hipster Index which evaluates and ranks the major cities of the world according to the number of vegan eateries, coffee shops, tattoo studios, vintage boutiques, and record stores per 100,000 city residents.