[1] The 3 Indian reservation school systems function as a union of towns.
"[3] School Administrative Districts (S.A.D.s) typically made up of 2 or more municipalities who cooperatively provide education to all of their students.
[4] Community School Districts (C.S.D.s) in which 2 or more cities cooperate to provide education to some or sometimes all grade levels.
[3] In Unions of Towns, two or more school administrative units share a common superintendent but are otherwise separate.
[5] The 3 Indian reservation school systems function as a union of towns.