School Administrative Districts (S.A.D.s) typically made up of two or more
municipalities which cooperatively provide education to all of their students with the resources of both or all merged together. , 184 cities and towns were served by 52 S.A.D.s, numbered 1 to 76 with numbers 2, 5, 9, 18, 21, 22, 25, 26, 34, 36, 38, 39, 43, 47, 48, 50, 56, 62, 66, 67, 69, 71, and 73 skipped. ==Regional School Units==