High Quality Content by WIKIPEDIA articles! Morris Hills High School is a comprehensive regional four-year public high school located in the borough of Rockaway, serving students in grades 9 - 12 in Morris County, New Jersey, United States, operating as part of the Morris Hills Regional High School District. The other high school in the district is Morris Knolls High School. The school located on the 39-acre (160,000 m2) former Gunther Estate, opened to students on September 9, 1953.