The Pascack Valley Regional High School District is a regional public high school district encompassing students from four communities in the Pascack Valley region of Bergen County, New Jersey, United States, serving students in ninth through twelfth grades from Hillsdale, Montvale, River Vale and Woodcliff Lake. As of the 2019–20 school year, the district, comprising three schools, had an enrollment of 1,987 students and 168.07 classroom teachers (on an FTE basis), for a student–teacher ratio of 11.8:1. The district is classified by the New Jersey Department of Education as being in District Factor Group "I", the second-highest of eight groupings. District Factor Groups organize districts statewide to allow comparison by common socioeconomic characteristics of the local districts. From lowest socioeconomic status to highest, the categories are A, B, CD, DE, FG, GH, I and J. History In 1955, Pascack Valley Regional High School District opened Pascack Valley High School with an enrollment of 650 students from the boroughs of Hillsdale, Montvale, River Vale, and Woodcliff Lake, having bonded $1,250,000 towards the costs of construction. Previously, students from those municipalities attended other local high schools, including Westwood High School. Students from Hillsdale, Montvale and Woodcliff Lake had attended Park Ridge High School. With increasing enrollment as the suburbs boomed, the towns, with state approval, formed a regional high school district. During the next several years enrollment increased and so did the faculty and building capacity. Additional classrooms were added and the program of studies was expanded. Increased enrollment in 1963 resulted in double sessions. In September 1964, Pascack Hills High School opened up to students living in Montvale, Woodcliff Lake and a portion of Hillsdale, with a flexible scheduling program that allowed students to select courses using a system run by an analyst from International Telephone and Telegraph using a mainframe computer system. Pascack Valley High School had the balance of Hillsdale students and all of River Vale students. In the early 1990s, western portions of Hillsdale (west of Pascack Road) transitioned from sending to Pascack Hills to Pascack Valley. By 1970, the enrollment was again up to capacity and building construction was necessary to house 1,800 students. This expansion of Pascack Valley High School provided additional classrooms, expanded department areas, and other facilities such as gymnasium, a new cafeteria and library. In March 2008, the district announced plans to offer online courses, beginning in the 2008–09 school year, with that