Arlington High School is located at 1157 Route 55 Lagrangeville, NY. This school is part of the Arlington Central School District and the Board of Education is the official policy-making body for this school. The school attends to the educational needs for grades 9 through 12 and adheres to the belief that all students develop intellectually, emotionally, physically, and socially at different paces. This public school is committed to the success of each child in a safe, supportive, and stimulating learning environment.

Arlington High School campus was first constructed in 1961, when the former high school, a 1930s-era WPA building in the Arlington area of Poughkeepsie, was converted into a middle school. In 1967, the first of several renovations took place, adding dozens of new classrooms to the building and raising building capacity to 1,500 students. In 1979, the current high school became "North Campus" for juniors, seniors and a portion of the sophomore class, while the former LaGrange Junior High School.

Just a short skip away on Stringham Road in Lagrangeville, was re-designated "South Campus" and housed freshman and the rest of the sophomore class. Some sophomore students split their days between the two campuses, and school buses came in both a "first wave" and a "second wave" to serve both campuses. Another renovation began at the high school in the autumn of 1998 that increased its size considerably, enabling all four grades to be moved back to what had been the North Campus.

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