Chicago, Illinois, is the largest city in the state and one of the most dynamic urban centers in the United States. Founded by Jean Baptiste Point du Sable in the late 18th century, the city was officially incorporated as a town in 1833 and as a city in 1837. Today, Chicago is home to approximately 2.7 million residents, making it the third-most populous city in the nation, while its metropolitan area houses over 9.4 million people.

Known as the “Windy City,” Chicago is famed for its iconic skyline, deep-dish pizza, world-class museums, and bustling cultural scene. The city serves as the seat of Cook County and boasts diverse neighborhoods, vibrant arts districts, and historic landmarks such as Navy Pier, Wrigley Field, and Buckingham Fountain.

Geographically, Chicago stretches over 234 square miles, including nearly 7 square miles of water along Lake Michigan. Its elevation ranges from 578 feet at the lakeshore to 672 feet near Blue Island. The city’s economy is equally impressive, with a metropolitan GDP of over $919 billion in 2024, ranking it among the top economic hubs in the nation.

Chicago’s government operates under a mayor–council system, led by Mayor Brandon Johnson, with a city council and supporting offices. The city continues to thrive as a center for commerce, culture, education, and innovation, attracting residents and visitors from across the globe.