Otisville High School was built in 1920 and opened in 1921 at the corner of Grove Street and Center Street, formerly State Street M-15, serving students from kindergarten through twelfth grade until 1955 as the town's second high school. It replaced the original 1868 school on Pine Street near North Street, now M-15, near the present post office. The building had ten classrooms on the top two floors, a large activities room, shop class, restrooms, locker room, and utilities on the lowest level, along with several offices, a small library, and storage rooms. In the early 1950s, growing enrollment and the need for an expanded curriculum led Otisville, Otter Lake, and Columbiaville to form the consolidated LakeVille school system on paper in 1954, and in the fall of 1955 high school students from the three towns began attending classes together in the new LakeVille High School, built on Wilson Road three miles from town. The Otisville building then continued as an elementary school until the late 1960s, but it deteriorated as the post-World War Two baby boom swelled the school system, with former students and faculty recalling falling plaster, a furnace that frequently stopped, and drafty windows. New elementary schools were built in the three towns, and another high school opened in 1969, closing the old Otisville building after its last classes in early June 1969. Sold to a private owner in 1971, it later had apartments on the top floor, but ongoing repairs proved too much and the building was eventually deemed unsafe. Members of the Otisville Area Historical Association removed the sign over the front door on a freezing February day in 2007, and the building was demolished a few days later. Former students especially remembered teacher and sometime principal Miss Adeline Kimball, longtime custodian Harry Kennedy, who rang the morning bell and sometimes gave tardy students an extra moment to reach their seats, and the many athletic trophies won by the green and white Otisville Spartans.