Thornton Fractional Township South High School is a high school located in Suburban Cook County, Illinois, located 6 miles (9.7 km) from the city limits of Chicago. The school serves an area of approximately 9 square miles (23 km2), & serves over 2,000 students in grades 9-12 who reside in the near South Suburban communities of Lansing and Lynwood.

Lansing is a village in Cook County, Illinois, United States. Lansing is a south suburb of Chicago. The population was 29,076 at the 2020 census.