| Locality | Post Code |
|---|---|
| Niinuma (相馬市) | 976-0011 |
| Nikkeshi (相馬市) | 979-2522 |
| Nishiyama (相馬市) | 976-0041 |
| Obama (相馬市) | 976-0022 |
| Okinochi (相馬市) | 976-0016 |
| Omagari (相馬市) | 976-0032 |
| Ono (相馬市) | 976-0053 |
| Onodai (相馬市) | 976-0001 |
| Others (相馬市) | 976-0000 |
| Otsubo (相馬市) | 976-0007 |
| Shiinoki (相馬市) | 976-0002 |
| Tachiya (相馬市) | 979-2531 |
| Tamano (相馬市) | 976-0154 |
| Tomizawa (相馬市) | 979-2532 |
| Tsubota (相馬市) | 979-2533 |
| Tsukanobe (相馬市) | 976-0003 |
| Tsukanomachi (相馬市) | 976-0015 |
| Wada (相馬市) | 976-0023 |
| Yamakami (相馬市) | 976-0151 |
| Yunuki (相馬市) | 979-2512 |