Thornton Township is one of thirty townships in Cook County, Illinois, USA. As of the 2000 census, its population was 180,802. Incorporated in 1850, it is the most populous township in Illinois as of the 2000 census. It is located immediately south of the city of Chicago. The population was 180,802 at the 2000 census. The village of South Holland, Illinois serves as the governmental seat of Thornton Township. The township is named after the village of Thornton, Illinois, located in the south central portion of the township. Many parts of the township carry names inspired by the village's... name, including the three high schools of Thornton Township District 205: Thornton Township High School in Harvey, Illinois; Thornwood High School in South Holland, Illinois; Thornridge High School in Dolton, Illinois; Thornton Fractional South High School in Lansing, Illinois; Thornton Fractional North High School in Calumet City, Illinois and Thornton Fractional Center for Academics and Technology also in Calumet City, Illinois. Supervisor Frank M.
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| County: | Cook County |
| State: | Illinois |
| Population: | 180,802 |
| Area: | 47.5 sq. mi. |
| Time zone: | Central Time zone |