Cicero is a town in Cook County, Illinois, United States, and a suburb of Chicago. As of the 2020 census, the population was 85,268, making it the 11th-most populous municipality in Illinois. The town is named after Marcus Tullius Cicero, a Roman statesman and orator. With over 89% of the town being of Hispanic descent, the town is the most Hispanic in t…Cicero is a town in Cook County, Illinois, United States, and a suburb of Chicago. As of the 2020 census, the population was 85,268, making it the 11th-most populous municipality in Illinois. The town is named after Marcus Tullius Cicero, a Roman statesman and orator. With over 89% of the town being of Hispanic descent, the town is the most Hispanic in the state of Illinois.