| Locality | Post Code |
|---|---|
| Sengokucho (石巻市) | 986-0827 |
| Shigeyoshicho (石巻市) | 986-0844 |
| Shimbashi (石巻市) | 986-0878 |
| Shimizucho (石巻市) | 986-0871 |
| Shimizudahama (石巻市) | 986-2413 |
| Shinei (石巻市) | 986-0004 |
| Shinsakaicho (石巻市) | 986-0864 |
| Shinsei (石巻市) | 986-2105 |
| Shintate (石巻市) | 986-0848 |
| Shiomicho (石巻市) | 986-0842 |
| Shiotomicho (石巻市) | 986-2114 |
| Sudachi (石巻市) | 986-2344 |
| Sue (石巻市) | 987-1221 |
| Suehirocho (石巻市) | 986-0875 |
| Suimei Kita (石巻市) | 986-0801 |
| Suimei Minami (石巻市) | 986-0802 |
| Sumiyoshicho (石巻市) | 986-0821 |
| Tachimachi (石巻市) | 986-0824 |
| Takaki (石巻市) | 986-0006 |
| Takenohama (石巻市) | 986-2346 |
| Tamichicho (石巻市) | 986-0872 |
| Taremizucho (石巻市) | 986-2104 |
| Tashirohama (石巻市) | 986-0023 |
| Teizan (石巻市) | 986-0851 |
| Tomarihama (石巻市) | 986-2401 |
| Tsukinora (石巻市) | 986-2352 |