Thornton Fractional Township District 215, more commonly known as T.F. District 215, is composed of two high schools and the supplementary Center for Academics and Technology.

Because of their excessively long names, among administrators and students alike, they are commonly referred to as T.F. North, T.F. South, and the CAT Center.

High schools

• Thornton Fractional Township North High School, in Calumet City, Illinois
  Calumet City, Illinois
  Calumet City is a city in Cook County, Illinois, United States. The population was 39,072 at the 2000 census. The ZIP code is 60409.Calumet City was founded in 1892 when the villages of Schrumville and Sobieski Park merged under the name of West Hammond, since it lies on the west side of the...
  
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• Thornton Fractional Township South High School, in Lansing, Illinois
  Lansing, Illinois
  Lansing is a village in Cook County, Illinois, USA. Lansing is a southern suburb of Chicago. The population was 28,332 at the 2000 census.-Geography:...
  
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• The Thornton Fractional Center for Academics and Technology, also in Calumet City.