Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 census, it is the third-most populous city in the United States after New York City and Los Angeles. As the seat of Cook County, the second-most populous county in the U.S., Chicago is the center of the Chicago metropolitan area, often colloquially called "Chicagoland" and home to 9.6 million residents.
AdVaccination helps you stay protected against severe COVID. See CDC vaccination guidance. COVID variants can change seasonally. Restore waning protection with the updated vaccine.
CDC COVID Vaccine Info. · Read Vaccine FAQs · CDC Guidelines for You
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