K
- (Iwafune-gun) Kanamaru
- (Sado Shi) Kamiyokoyama
- (Niigata Shi) Kami-wanō
- (Tainai Shi) Kami-tsuboana
- (Nagaoka Shi) Kamitomioka
- (Nagaoka Shi) Kaminozokimachi
- (Myoko-shi) Kamihorinouchi
- (Shibata Shi) Kamiakatani
- (Iwafune-gun) Kamaya
- (Niigata Shi) Kakudahama
- (Jōetsu Shi) Kakizaki
- (Itoigawa Shi) Kajiyashiki
- (Iwafune-gun) Kajikatani
- (Niigata Shi) Kameda-hayadōri
- (Sado Shi) Kitaushima
- (Sado Shi) Kitakoura
- (Sado Shi) Kawasaki
- (Sado Shi) Katanoo
- (Sado Shi) Kujikawachi
- (Sado Shi) Kaminiibo
- (Sado Shi) Kaminagaki
- (Sado Shi) Kubota
- (Sado Shi) Kitakawachi
- (Sado Shi) Kitatatsushima
- (Sado Shi) Kitatanoura
- (Murakami Shi) Kuwagawa
- (Murakami Shi) Kokonokaichi
- (Murakami Shi) Koide
- (Tainai Shi) Kubota
- (Murakami Shi) Koesawa