Chicago (/ ʃ ɪ ˈ k ɑː ɡ oʊ / shih-KAH-goh, locally also / ʃ ɪ ˈ k ɔː ɡ oʊ / shih-KAW-goh;), 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, following New York City and Los Angeles.With a population of 2,746,388 in the 2020 census, it is also the most populous city in the Midwestern ...Lori Lightfoot‧Chicago (Disambiguation)‧Mayor of Chicago‧Willis Tower‧List of Nicknames for Chicago‧Neighborhoods in Chicago.