| Locality | Post Code |
|---|---|
| Ogatsucho Osu (石巻市) | 986-1311 |
| Ogatsucho Shimogatsu (石巻市) | 986-1335 |
| Ogatsucho Tachihama (石巻市) | 986-1303 |
| Ogatsucho Wakehama (石巻市) | 986-1322 |
| Oginohama (石巻市) | 986-2341 |
| Oharahama (石巻市) | 986-2412 |
| Ohashi (石巻市) | 986-0805 |
| Okaidohigashi (石巻市) | 986-0855 |
| Okaidokita (石巻市) | 986-0854 |
| Okaidominami (石巻市) | 986-0856 |
| Okaidonishi (石巻市) | 986-0859 |
| Omiyacho (石巻市) | 986-2132 |
| Omori (石巻市) | 986-0121 |
| Onosaki (石巻市) | 986-0113 |
| Ori (石巻市) | 986-0005 |
| Orinohama (石巻市) | 986-2355 |
| Otemachi (石巻市) | 986-0838 |
| Others (石巻市) | 986-0000 |
| Oyagawahama (石巻市) | 986-2405 |
| Saiwaicho (石巻市) | 986-2122 |
| Sakanamachi (石巻市) | 986-0022 |
| Sakuramachi (石巻市) | 986-2137 |
| Samenora (石巻市) | 986-2403 |
| Samuraihama (石巻市) | 986-2351 |
| Saragai (石巻市) | 986-0104 |
| Sawada (石巻市) | 986-2102 |