Thomas Jefferson High School, also known as TJ High School, is a public high school in Northwest Dallas, Texas (USA) that serves grades 9-12. The school is part of the Dallas Independent School District (DISD) and is classified as a 5A school by the UIL. The school is named after the third President of the United States, Thomas Jefferson. It is adjacent to Walnut Hill International Leadership Academy, a Pre-K-8 DISD school. Source: Wikipedia (en)