Thornton Fractional North High School (T.F. North, TF North, TFN; formerly Thornton Fractional Township High School) is a Public Secondary school in Calumet City, Illinois. It first opened its doors in March 1926. The school serves Calumet City and Burnham. T.F. North also serves over 1,700 students in grades 9–12. The school's boundaries are the City of Chicago on the North,... Wikipedia