Residents of Allendale are served by a public school system that is known for its strong educational programs and community involvement. Elementary and middle school students attend schools within the Allendale School District, which has a reputation for high academic standards and a commitment to student development. For high school, students from Allendale, along with their peers from neighboring towns such as Ho-Ho-Kus and Saddle River, attend Northern Highlands Regional High School. This regional school is recognized for its competitive academic environment, a wide array of extracurricular activities, and a commitment to preparing students for post-secondary success. Hillside Elementary School (Grades PreK-3) 89 Hillside Avenue, Allendale, NJ 07401 (201) 327-2020 School Website Brookside Middle School (Grades 4-8) 100 Brookside Avenue, Allendale, NJ 07401 (201) 327-2021 School Website Northern Highlands Regional High School (Grades 9-12) 298 Hillside Avenue, Allendale, NJ 07401 (201) 327-8700 School Website