I
- (Minamiuonuma Shi) Itsukamachi
- (Murakami Shi) Itayagoshi
- (Jōetsu Shi) Itakura
- (Sado Shi) Inukamidaira
- (Shibata Shi) Inarioka
- (Ojiya-shi) Imosaka
- (Mitsuke Shi) Imamachi
- (Murakami Shi) Imajuku
- (Murakami Shi) Ikazuchi
- (Shibata Shi) Ijimino
- (Shibata Shi) Iijima
- (Higashikambara-gun) Igashima
- (Itoigawa Shi) Ichifuri
- (Niigata Shi) Ibarasone
- (Itoigawa Shi) Ichinono
- (Murakami Shi) Iioka
- (Itoigawa Shi) Itoigawa