Among these, the nine towns, Ushigafuchi-cho, Nishidani-cho, Kitadani-cho, Hachifuse, Nishinomine, Morigafuchi-cho, Iwagafuchi-cho, Maruyama, Kitagoto-cho belonged to the former Oaza Kita Ogurisu and the remaining six towns belonged to the former Oaza Minami Ogurisu.
うち、牛ケ淵町、西谷町、北谷町、鉢伏、西ノ峰、森ケ淵町、岩ケ淵町、丸山、北後藤町の9町は旧・大字北小栗栖、残余の6町は旧・大字南小栗栖である。