K
- (Niigata Shi) Kami-ikarashi
- (Niigata Shi) Kamishinden
- (Niigata Shi) Kuzutsuka
- (Tainai Shi) Kuwae
- (Tainai Shi) Kurokawa
- (Jōetsu Shi) Kuroi
- (Sado Shi) Kurohime
- (Murakami Shi) Kuroda
- (Tsubame Shi) Kugami
- (Niigata Shi) Kosudo
- (Uonuma Shi) Koide
- (Sado Shi) Koda
- (Higashikambara-gun) Kobanachi
- (Tainai Shi) Kitanarita
- (Murakami Shi) Kitanaka
- (Kashiwazaki Shi) Kitajō
- (Sado Shi) Kitaebisu
- (Tainai Shi) Kinoto
- (Gosen Shi) Kawaze
- (Gosen Shi) Kawamata
- (Myoko-shi) Kawakami
- (Sado Shi) Kawaharada-suwamachi
- (Nagaoka Shi) Kawaguchi-nakayama
- (Jōetsu Shi) Katamachi
- (Ojiya-shi) Katakaimachi
- (Murakami Shi) Kashio
- (Gosen Shi) Kariwa
- (Higashikambara-gun) Kanose
- (Murakami Shi) Kangawa
- (Murakami Shi) Kanaya