Blue Island is a city in Cook County, Illinois, United States, located approximately 16 miles south of Chicago's Loop. Blue Island is adjac…Blue Island is a city in Cook County, Illinois, United States, located approximately 16 miles south of Chicago's Loop. Blue Island is adjacent to the city of Chicago and shares its northern boundary with that city's Morgan Park neighborhood. The population was 22,558 at the 2020 United States census.
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