Ō
- (Natori Shi) Ōmagari
- (Kurihara Shi) Ōdori
- (Igu-gun) Ōuchi
- (Ishinomaki Shi) Ōzashi
- (Ōsaki Shi) Ōsawa
- (Higashimatshushima Shi) Ōhinata
- (Higashimatshushima Shi) Ōtsuka
- (Higashimatshushima Shi) Ōte
- (Higashimatshushima Shi) Ōshima
- (Higashimatshushima Shi) Ōshio
- (Ishinomaki Shi) Ōbandokoro
- (Ishinomaki Shi) Ōsawa
- (Higashimatshushima Shi) Ōkan
- (Higashimatshushima Shi) Ōmagari
- (Ishinomaki Shi) Ōdate
- (Watari-gun) Ōkuma-warabi
- (Kurihara Shi) Ōkawaguchi-konse
O
- (Oshika Gun) Onmaehama
- (Higashimatshushima Shi) Ono
- (Ishinomaki Shi) Oppa
- (Motoyoshi Gun) Oritate
- (Ishinomaki Shi) Ogatsuchō-ōsu
- (Kakuda Shi) Oyama
- (Ishinomaki Shi) Ogatsuchō-wakehama
- (Ōsaki Shi) Odai
- (Higashimatshushima Shi) Omotezawa
- (Ishinomaki Shi) Omotezawa
- (Ishinomaki Shi) Oire
- (Shibata-gun) Ono
- (Ōsaki Shi) Okadai