High Quality Content by WIKIPEDIA articles! Highland Park High School (HPHS), is a four-year comprehensive public high school, part of the Highland Park Public Schools system, that serves student in grades nine through twelve from the borough of Highland Park, in Middlesex County, New Jersey, United States. The school was established in 1926 as a junior high school, serving up to grade 10. Until HPHS became a senior high school in 1937, students from Highland Park finished their education at either New Brunswick High School or Metuchen High School.