High Quality Content by WIKIPEDIA articles! Thornton Fractional Township South High School (T.F. South, TF South, TFS) is a high school located in Suburban Cook County, Illinois, located about 6 miles (9.7 km) from the city limits of Chicago, 24 miles (39 km) south of Downtown Chicago. Thornton Fractional Township South High School is one of three high schools in the Village of Lansing, the others being Luther East High School & Illiana Christian High School. The school serves an area of approximately 9 square miles (23 km2), & serves over 1,800 students in grades 9-12 who reside in the near South Suburban communities of Lansing & Lynwood.