Contact UsNorthern Highlands Regional High School is located at 298 Hillside Ave, Allendale, NJ 07401. The planetarium is on the second floor of the school where the science wing was originally placed upon completion of our school building. Northern Highlands is made up of students from four different towns; Allendale, Saddle River, Upper Saddle River, and Ho-Ho-Kus. Northern Highlands currently has 1,352 students enrolled. The school is made up of students from grades 9-12 ranging in age from 14-18 years old.
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