| Locality | Postal Code |
|---|---|
| Himedomachi Futamado (上天草市) | 866-0102 |
| Himedomachi Himeura (上天草市) | 866-0101 |
| Matsushimamachi Aitsu (上天草市) | 861-6102 |
| Matsushimamachi Amura (上天草市) | 861-6101 |
| Matsushimamachi Imaizumi (上天草市) | 861-6103 |
| Matsushimamachi Kyoragi (上天草市) | 861-6105 |
| Matsushimamachi Uchinokawauchi (上天草市) | 861-6104 |
| Others (上天草市) | 869-3600 |
| Oyanomachi Iwa (上天草市) | 869-3604 |
| Oyanomachi Kami (上天草市) | 869-3602 |
| Oyanomachi Naka (上天草市) | 869-3603 |
| Oyanomachi Noboritate (上天草市) | 869-3601 |
| Oyanomachi Yushima (上天草市) | 869-3711 |
| Ryugatakemachi Hinoshima (上天草市) | 866-0203 |
| Ryugatakemachi Odo (上天草市) | 866-0201 |
| Ryugatakemachi Takado (上天草市) | 866-0202 |