Warren Hills Regional High School is a four-year public high school located on Jackson Valley Road in Washington Township in Warren County, New Jersey, United States, operating as part of the Warren Hills Regional School District. The school offers a comprehensive education for students in ninth through twelfth grades. The student population includes students from Franklin Township, Mansfield Township, Oxford Township, Washington Borough and Washington Township.As of the 2014-15 school year, the school had an enrollment of 1,286 students and 94.6 classroom teachers (on an FTE basis), for a student–teacher ratio of 13.6:1. There were 177 students (13.8% of enrollment) eligible for free lunch and 63 (4.9% of students) eligible for reduced-cost lunch.The present high school building located on Jackson Valley Road in Washington Township opened for the 1967-68 school year. An expansion of the high school building was completed in 1992, which included a new library and gym to accommodate the addition of students in ninth grade. A second expansion at the high school during the first decade of the 21st century added more classrooms, office space, gym/weight rooms, and conversion of the original gym to a new library to meet growing enrollment in the district. Recently, the district added an all-purpose athletic field, tennis courts, and practice field on an acquired tract of land on Jackson Valley Road.
