I
- (Hirado Shi) Iwanouechō
- (Tsushima-shi) Inohashi
- (Tsushima-shi) Iwashigaura
- (Tsushima-shi) Ikuchi
- (Tsushima-shi) Izuharamachi-magari
- (Tsushima-shi) Izuharamachi-koura
- (Tsushima-shi) Izuharamachi-kutamichi
- (Tsushima-shi) Izuharamachi-uchiyama
- (Tsushima-shi) Izuharamachi-shiine
- (Matsuura Shi) Imafukuchō-naberubaemen
- (Matsuura Shi) Imafukuchō-sakanomen
- (Hirado Shi) Ikemuke
- (Tsushima-shi) Izuharamachi-yoranaiin
- (Hirado Shi) Itoyachō
- (Hirado Shi) Iirachō
- (Hirado Shi) Ikitsukichō-misaki
- (Kitamatsuura-gun) Ichinosemen
- (Saikai-shi) Ikezaki
- (Saikai-shi) Ishida
- (Saikai-shi) Izarikami
- (Sasebo Shi) Isegawa
- (Higashisonigi-gun) Ishikigō
- (Higashisonigi-gun) Iwayagō
- (Higashisonigi-gun) Inorigōchigō
- (Higashisonigi-gun) Isekigō
- (Ōmura-shi) Imazugō
- (Hirado Shi) Ikitsukichō-yamadamen
- (Tsushima-shi) Izuharamachi-tsutsu
- (Hirado Shi) Ikitsukichō-tachiura
- (Tsushima-shi) Izuharamachi-tsutsuse