Glenn School dates at least from the early 20th century, an age attested by the presence of a long-established Glenn School Road. Its original wood-frame building was replaced at some time before 1950 with a one-story brick building. That, in turn, was demolished and replaced with the current facility in 1981. Remodeled in 1993, the school encloses 80,330 square feet and has an official student capacity of 549. The campus covers more than 34 acres.