About 2,700,000 people.

Chicago is the biggest city in Illinois and the third-largest in the whole United States. It sits on the shore of the huge Lake Michigan and is famous for its tall skyscrapers and friendly deep-dish pizza.
You can visit the shiny Cloud Gate sculpture that everyone calls The Bean, ride to the top of Willis Tower and stand on the glass ledge, or explore the amazing dinosaur bones at the Field Museum.
Downtown Chicago, called the Loop, is packed with towering buildings, busy trains that run on tracks above the street, and the sparkling riverwalk where boats float by.
Millennium Park and the long lakefront path give kids room to run, bike, and splash near the water, with big gardens and fountains to enjoy on sunny days.